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    • Posted by Sweetu Patel 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Sweetu Patel 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Siddhi Goyal 3 years, 7 months ago

    search in book

    0Thank You

    ANSWER

    • Posted by Pawandeep Kaur 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Jiya Yadav 3 years, 7 months ago

    Postulates of Rutherford atomic model based on observations and conclusions. Atoms nucleus is surrounded by negatively charged particles called elwectrons. The electrons revolve around the nucleus in a fixed circular path at very high speed. These fixed circular paths were termed as “orbits.”

    0Thank You

    Aditi Kumari 3 years, 7 months ago

    1‐ Most of the atom is empty space.2‐An atom is electrically neutral. This is because the number of protons and electrons in an atom is equal 3‐ An atom consists of a positively charged, dense and very small nucleus containing all the protons and neutrons .Almost the entire mass of an atom is concentrated in the nucleus. 4‐ The nucleus is surrounded by the negatively charged electrons. The electrons are revolving the nucleus in circular path at very high speed. The circular path of the electron are called orbits .

    2Thank You

    Seema Afroz 3 years, 7 months ago

    What is cell

    0Thank You

    Manyata Joshi 3 years, 7 months ago

    Postulates of Rutherford atomic modelbased on observations and conclusions. An atom is composed of positively charged particles. Atoms nucleus is surrounded by negatively charged particles called electrons. The electrons revolve around the nucleus in a fixed circular path at very high speed.

    0Thank You

    ANSWER

    • Posted by Drashya Shah 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Rishabh Kothari 3 years, 7 months ago

    True solutions and colloidal solution passes through filter paper.

    2Thank You

    Bhoomi Garg 3 years, 7 months ago

    Only true solution or solution can only pass through filter paper but suspension does not pass through filter paper

    3Thank You

    Anurag Shekhar 3 years, 7 months ago

    True solutions and colloidal solutions pass through filter paper and suspension does not

    3Thank You

    Drashya Shah 3 years, 7 months ago

    Pl tell its answer....

    1Thank You

    ANSWER

    • Posted by Pawandeep Kaur 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Drashya Shah 3 years, 7 months ago

    Hope it help u ????

    1Thank You

    Drashya Shah 3 years, 7 months ago

    LYMPH Lymph carries digested fat and a lot of white blood cells in the plasma.

    2Thank You

    Drashya Shah 3 years, 7 months ago

    BLOOD Blood has a fluid (liquid) matrix called plasma, in which red blood cells (RBCs), white blood cells (WBCs) and platelets are suspended. The plasma contains proteins, salts and hormones. Blood flows and transports gases, digested food, hormones and waste materials to different parts of the body.

    3Thank You

    ANSWER

    • Posted by Mohd Haseeb 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Jhanvi Chouhan 3 years, 7 months ago

    Solid

    0Thank You

    Vidushi Chordia 3 years, 7 months ago

    Solid

    0Thank You

    Uplaksh Goel 3 years, 7 months ago

    Solid

    1Thank You

    Shivam Tyagi 3 years, 7 months ago

    Ice

    0Thank You

    Ranjeet Kumar Pandit?? 3 years, 7 months ago

    Solid

    1Thank You

    ANSWER

    • Posted by Kanika Sharma 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Arhaan Mallik 3 years, 7 months ago

    Ncert :- Matter in our surrounding

    1Thank You

    Uplaksh Goel 3 years, 7 months ago

    Bio, chemistry or physics?

    1Thank You

    ANSWER

    • Posted by Amrit1158C☣️ Sb 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Aditi Kumari 3 years, 7 months ago

    The circular path of the electron are called orbits.

    1Thank You

    Drashya Shah 3 years, 7 months ago

    Hope it help u ????

    0Thank You

    Drashya Shah 3 years, 7 months ago

    Orbit is a well-defined circular path around the nucleus in which electrons revolve around the nucleus. It is also called a shell. It is denoted by the principal quantum number 'n'. Electrons can jump from one orbit to another by either absorbing energy or releasing energy.

    0Thank You

    ANSWER

    • Posted by Anurag Singh Thakur 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Atul Kumar 3 years, 7 months ago

    Electronic configuration of oxygen means O2 will be 2,6 in K,L because we all know that atomic no.of oxygen is 8 so first of all it will fill the K shell that is 2 and after that it will fill the L Shell that is 6 . But in case of S,P,D,F the electronic configuration will be 1s² 2s² 2p⁴ that is 2+ 2+4 is= 8.

    1Thank You

    Veera Babu R 3 years, 7 months ago

    [He] 2s² 2p⁴

    0Thank You

    Ananya Singh 3 years, 7 months ago

    K orbit me 2electron l me 6

    1Thank You

    Bharti Rani 3 years, 7 months ago

    K L 2 6

    2Thank You

    ANSWER

    • Posted by Pushkar Rawat 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Koina Shiyal 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Ashmita Das 3 years, 7 months ago

    They are nearly of 1nm

    1Thank You

    Ranjeet Kumar Pandit?? 3 years, 7 months ago

    Atom are smallest among all with which we compare or imagine it.size of atom be 1nm=10^-9m

    2Thank You

    Toshak Thakre 3 years, 7 months ago

    Smaller than these (.)

    1Thank You

    Koina Shiyal 3 years, 7 months ago

    Please help

    1Thank You

    ANSWER

    • Posted by Koina Shiyal 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Sibaram Dalai 3 years, 7 months ago

    Nice

    1Thank You

    Uplaksh Goel 3 years, 7 months ago

    h********?

    1Thank You

    ANSWER

    • Posted by Dev Dubey 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Devika K 3 years, 7 months ago

    No

    0Thank You

    Haarish Ahmad 3 years, 7 months ago

    No because kenitic enegry is the energy produced due to momentum

    1Thank You

    ANSWER

    • Posted by Gayatri Shinde 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Aditi Kumari 3 years, 7 months ago

    Freely falling body. Bicycle going down the clop of the road Ball rolling down an inclined plane.

    1Thank You

    Ashmita Das 3 years, 7 months ago

    Motion of a body falling freely under the action of gravity

    0Thank You

    ANSWER

    • Posted by Anand Kumar 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Tanishq Kumar 3 years, 7 months ago

    Electronic configuration of an atom is arrangement of electrons from its higher level around the nucleus

    0Thank You

    Devika Lather 3 years, 7 months ago

    Electronic configuration also called electronic structure. The arrangement of electrons in energy level around an atomic nucleus.

    1Thank You

    Devika Lather 3 years, 7 months ago

    Electronic configuration,

    1Thank You

    Bharti Rani 3 years, 7 months ago

    K l m n by bohrs formula

    1Thank You

    Dev Dubey 3 years, 7 months ago

    Valency

    0Thank You

    ANSWER

    • Posted by Sweetu Patel 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Saloni Tunwar 3 years, 7 months ago

    The process in which the movement of water and any substance through a plasma membrane ,high to low concentration is called osmosis

    0Thank You

    Rishabh Kothari 3 years, 7 months ago

    The passage of water from a region of high concentration to a region of low concentration through a semi-permeable membrane is called osmosis. The classification of solution on the basis of concentration is saturated, unsaturated solution.

    0Thank You

    Archi Jain 3 years, 7 months ago

    Movement of water from a region of higher concentration to lower concentration semi permeable membrane this is called osmosis

    4Thank You

    ANSWER

    • Posted by Rishi Yadav 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Shivam Tyagi 3 years, 7 months ago

    The light which is obtained from collid solution is thyndal effect

    0Thank You

    Dev Dubey 3 years, 7 months ago

    Scattering of a beam of light in colloidal solution is called Tyndall effect

    0Thank You

    Suraj Yadav 3 years, 7 months ago

    Tyndall effect, also called Tyndall phenomenon, scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room

    1Thank You

    ANSWER

    • Posted by Drashya Shah 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Ashmita Das 3 years, 7 months ago

    Vaccination is a biologically prepared product which contains typical agents resembling a microorganism that causes diseases, made from weakened or dead forms of the microbes, one of its surface proteins or its toxic

    1Thank You

    Rishabh Kothari 3 years, 7 months ago

    Vaccination is the preparations for the prevention of disease earlier

    2Thank You

    Rohit Das 3 years, 7 months ago

    Vaccination is a preparation that improves immunity to a particular disease. It is a biologically prepared product which contains typical agents resembling a microorganism that causes diseases, made from weakened or dead forms of the microbes, one of its surface proteins or its toxic

    2Thank You

    ANSWER

    • Posted by Rishabh Kothari 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Toshak Thakre 3 years, 7 months ago

    Because of continuously dividing

    0Thank You

    Archi Jain 3 years, 7 months ago

    Merstimatic tissues lack vacoules due to because they are continuously dividing so, they didn't need for any storage hence we know that function of vacoules is used for storage

    1Thank You

    Pooja Tyagi 3 years, 7 months ago

    °•

    0Thank You

    ANSWER

    • Posted by Sarthak Gartan 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Vidushi Chordia 3 years, 7 months ago

    Bio

    1Thank You

    Ranjeet Kumar Pandit?? 3 years, 7 months ago

    1.Define diffusion and osmosis 2.why plasma membrane is known as semipermeable membrane 3.what is cell division 4.name two organnels which have own DNA and protons 5.Define acute and chronic disease 6.define the vaccination 7.what is atom 8.define one mole 9.draw the labelled diagram of parenchyma,collenchyma and sclerenchyma 10.differentiate between electron ,proton and neutron 11.explain universal law of gravitation 12.prove:F=G×m1×m2/r^2 13.what is distillation 14.prove kinetic energy 15.differentiate between distance and displacement 16.differentiate between mass and weight 17.define balanced and unbalanced force 18.what is energy 19.what is acid rain 20.define nervous tissue 21.what is global warming 22.define law of constant proportion 23.what was Dalton atomic theory 24.prove law of conservation of mass 25.by which process we can separate two immiscible liquid 26.define colloidal solution 27.difference between mixture and compound 28.plasma membrane made up of which things 29.cell wall made up of which things 30.give characteristics of bone 31.what is voluntary muscles 32.explain free fall 33.what is buoyant force 34.define infectious diseases 35.who discovered the vaccination and how 36.how ozone layer useful for human beings 37.define third law of motion 38.what is inertia 39.define effect of force 40.differentiate xylem and phloem

    1Thank You

    Suraj Yadav 3 years, 7 months ago

    Which subject

    3Thank You

    ANSWER

    • Posted by Prashant Rai 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Bhargavi Kulkarni 3 years, 7 months ago

    for example communicable disease spread from infected person to healthy through air , water , food or by physical contact or such disease causing microbes can spread through air this occur through the little droplets thrown out by infected person who sneezes or coughs example = common cold , pneumonia , tuberculosis

    1Thank You

    ANSWER

    • Posted by Gigi8 Jvigigogogo 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Mohit Kumar 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shiven Yadav 3 years, 7 months ago

    Because their only function is to increase in their organs a d body parts

    1Thank You

    ANSWER

    • Posted by Minu Dalei 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Rishabh Kothari 3 years, 7 months ago

    Can anyone write the steps for this sum?

    0Thank You

    Pravesh Giri 3 years, 7 months ago

    7.29 E9 is the answer .

    3Thank You

    ANSWER

    • Posted by Minu Dalei 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Sweetu Patel 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Vidharshana Yathra Prakkash 3 years, 7 months ago

    MASS NO: THE SUM OF PROTOAN AND NEUTRON ATOMIC NO:NO OF ELECTRONS PRESENT IN A NUCLEUS

    2Thank You

    ANSWER

    • Posted by Minu Dalei 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Minu Dalei 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Minu Dalei 3 years, 7 months ago

    Calculate the work done by the person in lifting the box

    2Thank You

    ANSWER

    • Posted by Amrit1158C☣️ Sb 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Harpreet Singh 3 years, 7 months ago

    The electron cloud model is currently the most sophisticated and widely accepted model of the atom. It retains the concept of the nucleus from Bohr and Rutherford's models, but introduces a different definition of the motion of electrons around the nucleus.

    1Thank You

    Harpreet Singh 3 years, 7 months ago

    1. How do electrons move in Bohr’s model? Ans: The theory notes that electrons in atoms travel around a central nucleus in circular orbits and can only orbit stably at a distinct set of distances from the nucleus in certain fixed circular orbits. Such orbits are related to certain energies and are also referred to as energy shells or energy levels. 2. How did Bohr discover electrons? Ans: Bohr was the first to discover that electrons move around the nucleus in different orbits and that an element’s properties are determined by the number of electrons in the outer orbit. 3. Did Bohr’s model have neutrons? Ans: The nucleus in the atom’s Bohr model holds most of the atom’s mass in its protons and neutrons. The negatively charged electrons, which contribute little in terms of mass, but are electrically equivalent to the protons in the nucleus, orbit the positively charged core. 4. How did Sommerfeld modify Bohr’s theory? Ans: Many modifications have been introduced to the Bohr model, most notably the Sommerfeld model or Bohr – Sommerfeld model, which suggested that electrons move around a nucleus in elliptical orbits rather than circular orbits of the Bohr model. The Bohr – Sommerfeld system was essentially incoherent, contributing to many paradoxes. 5. Who discovered electrons? Ans: J. J. Thomson in 1897 discovered Electron when he was studying the properties of the cathode ray.

    2Thank You

    Harpreet Singh 3 years, 7 months ago

    Bohr model of the atom was proposed by Neil Bohr in 1915. It came into existence with the modification of Rutherford’s model of an atom. Rutherford’s model introduced the nuclear model of an atom, in which he explained that a nucleus (positively charged) is surrounded by negatively charged electrons. Bohr modified this atomic structure model by explaining that electrons move in fixed orbitals (shells) and not anywhere in between and he also explained that each orbit (shell) has a fixed energy level. Rutherford basically explained the nucleus of an atom and Bohr modified that model into electrons and their energy levels. Bohr’s model consists of a small nucleus (positively charged) surrounded by negative electrons moving around the nucleus in orbits. Bohr found that an electron located away from the nucleus has more energy, and electrons close to the nucleus have less energy. Postulates of Bohr’s Model of an Atom In an atom, electrons (negatively charged) revolve around the positively charged nucleus in a definite circular path called orbits or shells. Each orbit or shell has a fixed energy and these circular orbits are known as orbital shells. The energy levels are represented by an integer (n=1, 2, 3…) known as the quantum number. This range of quantum number starts from nucleus side with n=1 having the lowest energy level. The orbits n=1, 2, 3, 4… are assigned as K, L, M, N…. shells and when an electron attains the lowest energy level, it is said to be in the ground state. The electrons in an atom move from a lower energy level to a higher energy level by gaining the required energy and an electron moves from a higher energy level to lower energy level by losing energy. Limitations of Bohr’s Model of an Atom Bohr’s model of an atom failed to explain the Zeeman Effect (effect of magnetic field on the spectra of atoms). It also failed to explain the Stark effect (effect of electric field on the spectra of atoms). It violates the Heisenberg Uncertainty Principle. It could not explain the spectra obtained from larger atoms.

    1Thank You

    ANSWER

    • Posted by Gautam Kumar Yadav 3 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Aditi Kumari 3 years, 7 months ago

    A body is said to he in motion (or moving)when its position changes continuously with respect to a stationary object.

    1Thank You

    Ved Bhilware 3 years, 7 months ago

    Motion, in physics, change with time of the position or orientation of a body. Motion along a line or a curve is called translation. ... In both cases all points in the body have the same velocity (directed speed) and the same acceleration (time rate of change of velocity).

    1Thank You

    Akshiii ?? 3 years, 7 months ago

    Anything which is in state of moving ,is said to be in motion.~ Hope it helps ?

    1Thank You

    ANSWER

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