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Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.

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Hitesh Singh 3 years, 7 months ago

Isotope is atom of same element that have same atomic number but different atomic mass is called isotope . For example: chlorine isotope. Mass of chlorine isotope is 35and37 but atomic number is same 17

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Define electrons & neutrons & protons

Posted by Arshi Naushad 3 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Satyaki Yadav 3 years, 7 months ago

Electron - The negatively charged atomic sub-partical, which revolve around nucleus. It was discovered by J.J. Thomson. It's weight is 1/2000 times of proton. Proton - It is the positively charged atomic sub-partical. It was discovered by E. Goldstein. It is inside the nucleus and it's weight is 2000 times of electron. Neutron - It is neutral (with no charge) atomic sub-partical. It was discovered by Neil bohr. It is present inside the nucleus.

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Hitesh Singh 3 years, 7 months ago

Electron Negative charge Outside nucleus Mass 9.1*10^-31kg Charge 1.6*10^-19C Neutron No charge Inside nucleus Mass 1.6*10^-27 kg Charge zero Proton Positive charge Inside nucleus Mass-same as nucleus Charge -1.6*^-19

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The maximum speed of train is 80km/h. It takes 10h to cover a distance of 400km. Find the ratio of its maximum speed to its average speed.

Posted by Kavitha K 3 years, 7 months ago

CBSE > Class 09 > Science

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What is uneven speed

Posted by Vansh Mandloi 3 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Satyaki Yadav 3 years, 7 months ago

Uneven speed also known as non-uniform motion in which a body cover uneven distance in in unequal intervals of time. Eg. A body covers 1m in 2sec and another 3m in 4sec.

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An unlocked truck weighing 2000kg has maximum acceleration of 0.5m/s2 . What is the maximum acceleration when it is carrying a load of 2000kg ?

Posted by Maya Shukla 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

1st case (unloaded truck)
m= 2000kg
a= 0.5 m/s²
F=m ×a
F= 2000×0.5 =1000N

2nd case (loaded truck)
m= 2000+2000= 4000kg
F=1000N (same) remain unchanged
F=m/a
a= F/m
a=1000/4000
a=0.25 m/s2

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Sir can you tell the points of fundamental units of life

Posted by Anjali Pal 3 years, 7 months ago

CBSE > Class 09 > Science

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An atom has 13 Protons and 14 Neutrons.Give its:-(i) Nearest nobel gas

Posted by Moksh Yadav 3 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Sarita Panda 3 years, 7 months ago

Neon

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What do you mean by cell organelles?

Posted by Me Kyu Btau 3 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Radha Pal 3 years, 7 months ago

Cell organelles are organelles which helps body to perform

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A gymnast is bouncing on a trampoline after a high bounce the gymnast comes down and hits the elastic surface of the trampoline in so doing the gymnast applies a force to the trampoline. State the effect that this force has on the elastic surface.the surface applies a reaction force to the gymnast. Describe the effects that this reaction force has on the gymnast

Posted by Gaurang Aggarwal 3 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Yash Verma 3 years, 7 months ago

Defination of motion

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Siddarth Shetty 3 years, 7 months ago

elastic potential energy

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Posted by Gaurang Aggarwal 3 years, 7 months ago

CBSE > Class 09 > Science

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why does a body reach the ground

Posted by Shreyansh Sharma 3 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Radha Pal 3 years, 7 months ago

Due to gravity

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Abhyuday Sharma 3 years, 7 months ago

Because of gravity, or acceleration due to gravity

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Aarushi Erande 3 years, 7 months ago

Due to gravitational force

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Explain with an activity to show that mTerial medium is necessary for the propogational of sound?

Posted by Chandrashekar Shirni 3 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Me Kyu Btau 3 years, 7 months ago

Bell-jar experiment demonstrates that sound needs a medium for its propagation. Take an electric bell and an air tight glass bell jar connected to a vacuum pump. Suspend the bell inside the jar, and press the switch of the bell. ... This shows that sound needs a material medium to travel

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An atom has 13 Protons and 14 Neutrons.Give its:-_______(i) Valence electrons (ii) Nearest nobel gas

Posted by Moksh Yadav 3 years, 7 months ago

CBSE > Class 09 > Science

5 answers

Ayushi Shrivastava 3 years, 7 months ago

3valence electrons

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Aman Singh 3 years, 7 months ago

3 valence electron

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Satyarth Khajuria 3 years, 7 months ago

It has 3 valence electrons

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Hunny Bunny 3 years, 7 months ago

(ii) nearest noble gas

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Simran Dumra 3 years, 7 months ago

(ii) nearest nobel gas

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An atom has 7 electrons in its L shell, predict its Atomic number

Posted by Gaurav Balla 3 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Aman Singh 3 years, 7 months ago

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Satyarth Khajuria 3 years, 7 months ago

9, because K shell contain 2 electrons and L shell contains 7 electrons so, 9 is its atomic number and it contains 9 electrons.

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Hunny Bunny 3 years, 7 months ago

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Simran Dumra 3 years, 7 months ago

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A body of mass 10kg moving with velocity 10m/s on horizontal plane. What would be work done by friction force if its come in rest

Posted by Zaki Rehman 3 years, 7 months ago

CBSE > Class 09 > Science

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What is the function of areolar tissue

Posted by Anu Yalani 3 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Me Kyu Btau 3 years, 7 months ago

Acts as a binding tissue. Bind the skin with muscles. Bind the blood vessels and nerves with other structures of body. Helps in healing of wounds

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Zaki Rehman 3 years, 7 months ago

It connects the organ loosely

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What is time ?

Posted by Ishan Vashist ??? 3 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Me Kyu Btau 3 years, 7 months ago

Time in physics is defined by its measurement: time is what a clock reads. In classical, non-relativistic physics, it is a scalar quantity (often denoted by the symbol. ) and, like length, mass, and charge, is usually described as a fundamental quantity. ?

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Satyarth Khajuria 3 years, 7 months ago

Time= Distance/ speed

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Anu Yalani 3 years, 7 months ago

Time = distance/displacement ÷ speed/velocity

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How does solubility of a solid in water change with temperature?

Posted by Pavani Naidu 3 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Aarushi Erande 3 years, 7 months ago

Solubility of solids in water increases with increase in temperature. Eg: salt in water

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What is the utility of tissues in multicellular organisms?

Posted by Abhinav Raj 3 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Vaishnnavi P 3 years, 7 months ago

it helps in division of labour and increases efficiency

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Explain fundamental particles of an atom with charge, symbol, location

Posted by Jyoti Choudhary 3 years, 7 months ago

CBSE > Class 09 > Science

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Is it possible for the atom of an element to have one electron, one proton and no neutron. If so, name the element .

Posted by Tanishka Rana 3 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Simran Dumra 3 years, 7 months ago

Yes , the answer is hydrogen

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Samiksha Bhatt 3 years, 7 months ago

Yes. Hydrogen atom contains one proton and one electron, but no neutron.

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Shiva Singh 3 years, 7 months ago

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What is *** hormone

Posted by Gaurab Saha 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

*** hormones, also known as *** steroids, gonadocorticoids and gonadal steroids, are steroid hormones that interact with vertebrate steroid hormone receptors. The *** hormones include the androgens, estrogens, and progestogens.

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Define relative density what is the density of silver given that its relative density is 10.3

Posted by Rashi Kakodiya 3 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Ælßhîfæ K_H_Â_Ñ 3 years, 7 months ago

Don't worry this is deleted from cbse syllabus ??

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Objective question chapter 3 1 page 30 question

Posted by Riddhi Rajgurur 3 years, 7 months ago

CBSE > Class 09 > Science

0 answers

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what is meant by gravitational force

Posted by Tushar Kumar 3 years, 7 months ago

CBSE > Class 09 > Science

5 answers

Shiva Singh 3 years, 7 months ago

It is force actting between heavy body to heavy or lighter body with some distance.

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Pravin Kumar 3 years, 7 months ago

In a Universe every object attract every other object with a force. This force is known as force of GRAVITY OR_ GRAVITATIONAL FORCE

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Sandeep Singh 3 years, 7 months ago

The non contact force of attraction acting between two bodies is called as gravitational force

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Cheshta Bansal 3 years, 7 months ago

The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. In fact, every object, including you, is pulling on every other object in the entire universe!

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Mouly Das 3 years, 7 months ago

It is defined as the gravitational force between two bodies of unit masses separated by a unit distance.

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What is mole concept. ??? .

Posted by Komal Kumar Yadav 3 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Cheshta Bansal 3 years, 7 months ago

It is used to find the number of molecules in given amount of molecule. Mole introduce a relationship known as mole concept..

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Nidhi Kumari 3 years, 7 months ago

Mole is the number of all the atoms and molecule in gram one Mole is equal to 6.022multiply by 10 ki power 23

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chapter 5

Posted by Moksh Dayma 3 years, 7 months ago

CBSE > Class 09 > Science

0 answers

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Differentiate between zylem and phoelm

Posted by Narayan Nagar 3 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Nayan Chaturvedi 3 years, 7 months ago

Xylem transport mineral and water to leaf of plant to do the process photosynthesis to make energy and glucose for plant and phloem take the energy and glucose from leaf and transport all the body part of plant the force applied on xylem phloem are cohesive and adhesive force

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Sukhmandeep Kaur Sidhu 3 years, 7 months ago

Xylem and phloem facilitate the transportation of water, minerals and food throughout the plant. Xylem→ carries water and minerals from the roots to the leaves. Phloem→ carries the food prepared by the leaves to different parts of the plant.

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Nandini Yadav 3 years, 7 months ago

Xylem=Transport minerals and water from roots Phloem=Transport food from leaves to all parts of plant

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Avinash ke gane ki speed of a term is minus one against the frictional force of 10n and Kapil can move at a speed of 50 m s -1 against friction force of 25 and who is more powerful and why

Posted by Ashana Dahariya 3 years, 7 months ago

CBSE > Class 09 > Science