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Manoj Kumar 4 years ago

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Bromine occurs in nature mainly in the form of two isotopes. If the evundance of bromine 79 br is 49.7percent and that of br. 81 is 50.3percent . Calculate the atomic mass of bromine

Posted by Manoj Kumar 4 years ago

CBSE > Class 09 > Science

0 answers

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A sample of an element X contains two isotopes X. If the average atomic mass of this sample of the element be 16.2 .calculate the percentage of isotopes in this sample

Posted by Manoj Kumar 4 years ago

CBSE > Class 09 > Science

0 answers

ANSWER

Plasma membrane is composed of?

Posted by Keshav Maratha 4 years ago

CBSE > Class 09 > Science

4 answers

Shikha Shrivastava 4 years ago

Proteins and lipids

Yogesh Jangid 4 years ago

Phospholipids ??

Abha Mahant 4 years ago

Proteins and lipids

Ranu Singh 4 years ago

Phospholipids

3Thank You

ANSWER

Define reference point?

Posted by Likhitha Lucky 4 years ago

CBSE > Class 09 > Science

2 answers

Santosh Narasimha Sarma Gollapudi 4 years ago

a basis or standard for evaluation, assessment, or comparison; a criterion.

Yogita Ingle 4 years ago

A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a tree, or a sign - make good reference points.

ANSWER

Who discovered neutron ??

Posted by Palak Pandey 4 years ago

CBSE > Class 09 > Science

2 answers

Atul Kumar Dwivedi 4 years ago

James Chadwick

Gaurav Seth 4 years ago

The British physicist Sir James Chadwick discovered neutrons in the year 1932. He was awarded the Nobel Prize in Physics in the year 1935 for this discovery.

How were Neutrons Discovered?

James Chadwick fired alpha radiation at beryllium sheet from a polonium source. This led to the production of an uncharged, penetrating radiation.
This radiation was made incident on paraffin wax, a hydrocarbon having a relatively high hydrogen content.
The protons ejected from the paraffin wax (when struck by the uncharged radiation) were observed with the help of an ionization chamber.
The range of the liberated protons was measured and the interaction between the uncharged radiation and the atoms of several gases was studied by Chadwick.
He concluded that the unusually penetrating radiation consisted of uncharged particles having (approximately) the same mass as a proton. These particles were later termed ‘neutrons’.

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What happen if we add copper sulphate crystal in water

Posted by Tanu Prajapati 4 years ago

CBSE > Class 09 > Science

3 answers

Tanu Prajapati 3 years, 11 months ago

Thanks for answer

Santosh Narasimha Sarma Gollapudi 4 years ago

If copper sulphate crystals are added to water then the particles of copper sulphate crystals loses attraction between them and starts moving continuously and gets mixed up with water . Water color changes to blue

Yogita Ingle 4 years ago

ANSWER

Is light matter??

Posted by Raman Kumar Rajeev 4 years ago

CBSE > Class 09 > Science

5 answers

Atul Kumar 4 years ago

Ikbaal Khan 3 years, 6 months ago

who was the men of the english

Saurabh Pandey 4 years ago

Not matter

Divyanshu ??☺ 4 years ago

Hello

《Aruba》°°° 《Sayed》❤ 4 years ago

Light is a form of energy, not matter...matter is made up of atoms...light is actually electromagnetic radiation...

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A stone of mass 2 kg initially at rest suddenly breaks up into two pieces of masses 1.2 kg and 0.8 kg respectively. If the lighter fragments travelled with a velocity of 3 m/s due east , then find the velocity and direction of heavier fragment

Posted by Shaswat Aryan 4 years ago

CBSE > Class 09 > Science

0 answers

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Give me answer of the between the Diffusion and tissue.... Please Yogita Ingle. I op that you have known the answer.. please please please please please give me answer please

Posted by Arun Kushwah 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

Diffusion: Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration down the concentration gradient.

Tissue: All living things are composed of cells, and a group of cells form tissues. These tissues combine to form organs, and the organs form an organ-system. The tissues perform simpler tasks, whereas, the organs perform the complex functions of the body. Tissues are evenly distributed throughout the body and perform specific functions in plants and animals.

ANSWER

Give me difference between the Diffusion and tissue.... Please give me answer as fast as possible please please please please ??????? Okay

Posted by Arun Kushwah 4 years ago

CBSE > Class 09 > Science

1 answers

Arun Kushwah 4 years ago

At list three or four... If you know two examples you can give me answer Okay ???

3Thank You

ANSWER

Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have

Posted by Ayush Bhati 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus.

Mass of atom =Protons +Neutrons

Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass.

4u =2u +Neutrons

Neutrons =4-2 =2

Hence, it must contain 2 neutrons.

ANSWER

A weight of an aircraft is 980 newton what is the mass of the aircraft

Posted by Aravintha Krishnan Varatharajan 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

The most common definition of weight is the force exerted on a body by gravity. This is often expressed in the formula W = mg, where W is the weight, m the mass of the object, and g gravitational acceleration, g=9.81 on a surface of the earth.

so if W=980N then m=W/g =1980/ 9.8=100kg

ANSWER

What are the differences between uniform motion and uniform speed?

Posted by Mithilesh Kumar 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

Uniform Motion:

This type of motion is defined as the motion of an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the duration of the time.

Example of Uniform Motion:

If the speed of a car is 10 m/s, it means that the car covers 10 meters in one second. The speed is constant in every second.
Movement of blades of a ceiling fan.

Uniform speed: A object is said to be in uniform speed when the object covers equal distance in equal time intervals.

ANSWER

Why vacuoles are absent in the meristem tissue?

Posted by Mithilesh Kumar 4 years ago

CBSE > Class 09 > Science

2 answers

Dhanush M 4 years ago

Because meristem function is to grow... And vacuole is related to storage and many more.. In meristem there is need for division of cell..so vacuole was of no need in there cell. Hence,they lack vacuole They had Dense cytoplase Prominent nuclei Cellulosic cell wall

S S 4 years ago

ANSWER

Which of the following statements is/are correct

Posted by John Hatzaw 4 years ago

CBSE > Class 09 > Science

0 answers

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Give the distribution of electron in carbon and sodium atom

Posted by Naina Tirkey 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

The total number of electrons in a carbon atom is 6. The distribution of electrons in carbon atom is given by: First orbit or K-shell = 2 electrons
Second orbit or L-shell = 4 electrons
Or, we can write the distribution of electrons in a carbon atom as 2, 4.
The total number of electrons in a sodium atom is 11.
The distribution of electrons in sodium atom is given by:
First orbit or K-shell = 2 electrons
Second orbit or L-shell = 8 electrons
Third orbit or M-shell = 1 electron
Or, we can write distribution of electrons in a sodium atom as 2, 8, 1.

ANSWER

Draw back of Dalton atomic theory

Posted by Vivek Aswal 4 years ago

CBSE > Class 09 > Science

1 answers

Mohd Aman Raza Khan 4 years ago

Draw back of doltan theory 1) doltan said that atom is the smallest unit which can not be divided but today scientist found that in some surcumtenced atom can be divided into electron proton and neuron. 2) doltan said that atom of same element have same structure and chemical properties but today it is found that atom of same element can have different structure and chemical properties. 3) Doltan said that atom of different element have different structure and chemical properties but today it found that atom of different element can have same structure and chemical properties.

ANSWER

Difference between gravitation and gravity

Posted by Vignesh Gupta 4 years ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 4 years ago

Gravitation

Gravity

1. It is the force of attraction acting between two bodies in the universe.

2. Gravitational force's formula is

_3.The direction of gravitational force lies in the radial direction from the masses

It is the earth's gravitational pull on any body lying on its surface.
Gravity is calculated by using.

F = mg

3. The direction of the force of gravity is along the line joining the earth’s center and the center of the body. Its direction is towards the center of the earth.

ANSWER

What is the difference between Na and Na^+

Posted by Palak Pandey 4 years ago

CBSE > Class 09 > Science

4 answers

Sidharth Singh Shekhawat 4 years ago

NA is a atom but NA+ is a ion

Arun Kushwah 4 years ago

Na is a atom but the Na+ is a ion

Lav Khator 4 years ago

Na is atom but Na+ is ion

Pranav Dhakre 4 years ago

In Na the electron rate is constant but in Na-having or one less electron

ANSWER

How can we observe weight in any question ??I mean formula of weight

Posted by Palak Pandey 4 years ago

CBSE > Class 09 > Science

2 answers

Lav Khator 4 years ago

Weight = mass × acceleration due to gravity

Kanishka Chauhan 4 years ago

Weight = mg

ANSWER

What is avogadro constant??

Posted by Palak Pandey 4 years ago

CBSE > Class 09 > Science

1 answers

Lav Khator 4 years ago

6.022 × 10 ^23

ANSWER

Discovery of cell membranes

Posted by Adarsh Singh 4 years ago

CBSE > Class 09 > Science

2 answers

Abhinandan Dubey 4 years ago

Robert Hooke

Ananya K 4 years ago

Since the invention of the microscope in the seventeenth century it has been known that plant and animal tissue is composed of cells : the cell was discovered by Robert Hooke. ... Based on these observations, Quincke asserted that the cell membrane comprised a fluid layer of fat less than 100 nm thick.

ANSWER

(2). Explain cell division...

Posted by Arun Kushwah 4 years ago

CBSE > Class 09 > Science

2 answers

Tejas Patil 4 years ago

Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle. ... Meiosis results in four haploid daughter cells by undergoing one round of DNA replication followed by two divisions.

Ananya K 4 years ago

ANSWER

Answer the questions. (1) Explain Nervous tissue...

Posted by Arun Kushwah 4 years ago

CBSE > Class 09 > Science

2 answers

Abhinandan Dubey 4 years ago

Nervous tissue is the longest tissue in human body.

Lav Khator 4 years ago

Nervous tissue is the longest tissue in a human body. This tissue help in transfer of impulses. It contains parts like cyton, axon and dendrites. Dendrites receive impulses whereas axon takes the impulses away. This axon is covered by sheath known as myelin sheath of medullary sheath

ANSWER

3. Write short note on Mitochondria. Please solve this problem please give me answer please

Posted by Arun Kushwah 4 years ago

CBSE > Class 09 > Science

1 answers

Ash Atul 4 years ago

Mitochondria is the power house of the cell. All the energy which is required for the chemical activity and living life is released by the mitochondria in the form of adenosine triphosphate. Atp is energy currency for the cell. It helps in making chemical compounds and help in mechanical processes. Mitochondria is a organelle which has its own dna material and ribosomes. Ribosomes helps in the protein production for mitochondria.

ANSWER

when the liquid is spun rapidly the denser particle are forced to the bottom and the lighter particle stay at the top this principle is used in

Posted by Mayank Shrivastav 4 years ago

CBSE > Class 09 > Science

2 answers

Tanya Srivastava 4 years ago

This is the principle of centrifugation- It is generally used to separate milk and cream, or to separate blood and its components. In daily life, it is used by washing machines to squeeze out water from wet clothes.

Aarushi Erande 4 years ago

ANSWER

Definition of law of universal gravitation and derivation and diagram

Posted by Parth Patel 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

Newton’s conclusion about the magnitude of gravitational forces is summarized symbolically as

F = Gm₁m_2/r²

where,

F is the gravitational force between bodies
m₁ is the mass of one of the objects
m₂ is the mass of the second object
r is the distance between the centres of two objects
G is the universal gravitational constant

The constant proportionality (G) in the above equation is known as the universal gravitation constant. The precise value of G was experimentally determined by Henry Cavendish in the century after Newton’s death. The value of G is found to be G = 6.673 x 10^-11 N m²/kg².