Electron

Q.

The charge on the proton.

Q.

What are the observations and conclusions drawn by J.J. Thomson while conducting experiments with a discharge tube for studying the properties of cathode rays?

Q.

Explain the discovery of electron by Thomson.

Q.

What are the cathode rays constituted of?

1. protons

2. neutrons

3. electrons

4. positively charged alpha particles

Q.

Anode rays were discovered by__________________.

Q.

Mass of electron and neutron are the same.

1. True
2. False

Q. Which of the following statements are correct regarding the electrical charge of electrons and protons?

1. Electrons are positively charged.
2. Electrons are negatively charged.
3. Protons are positively charged.
4. Protons are negatively charged.

Q.

How will you explain that the electron is a negatively charged particle ?

Q.

The electrons have practically ________ mass as compared to the mass of nucleus.

Q.

What is the difference between the Compton effect and photoelectric effect?

Q.

Does an electron have Mass?

Q.

Electron is deflected towards the___charged plate. (positively, negatively)

Q.

Give relative charge and mass of electron, proton, and neutron.

Q. Electrons were discovered by _______.

1. Albert Einstein

2. Sir Joseph John Thomson

3. Sir Edmund Hillary

4. William Tronisery

Q. An electron has a

1. Relative charge of -1
2. Charge is opposite and equal to a proton
3. All of these
4. Negligible mass

Q.

How does the development of electrostatic charge when a glass rod is rubbed with silk deny the existence of a neutral indivisible atom?. Explain.

Q.

The charge on an electron is _______ coulombs.

1. $+1.602\times {10}^{19}$
2. $+1.602\times {10}^{-19}$
3. $-1.602\times {10}^{19}$
4. $-1.602\times {10}^{-19}$

Q.

Energy is ________ when an electron jumps from higher energy level to lower energy level.

1. absorbed

2. released

3. neither absorbed nor released

4. neither absorbed nor released

Q.

Who among the following discovered electrons?

1. J.J Thomson

2. Rutherford

3. Charles Darwin

4. Chadwick

Q.

J. J. Thomson performed cathode ray tube experiment in which electricity was passed through a coil in the cathode ray tube and scintillations were observed on the screen. Cathode rays which strike on the screen were nothing but:

1. Electrons

2. Protons

3. Neutrons

4. Can be any of the above

Q.

How many times a proton is heavier than an electron ?

Q.

Mass of the electron is approximately 1837 times that of the proton.

1. True

2. False

Q.

Select the correct statements regarding the electrical charge of electrons and protons.

1. negatively, positively

2. positively, negatively

3. negatively, negatively

4. positively, positively

Q.

What are the cathode rays composed of?

1. Only mass
2. Only charge
3. Neither mass nor charge
4. Both mass and charge

Q. Is centriole present in early(immature) neutron?

Q.

Select the correct statements regarding the electrical charge of electrons and protons.

1. negatively, positively

2. positively, negatively

3. negatively, negatively

4. positively, positively

Q. what do we mean by this statement" 1 second is the duration of 9192631770 periods of the radiation corresponding to the transition between 2 hyperfine levels of ground state of cesium- 133 atom"?

Q.

A charged entity radiating energy is not considered to be stable.

1. True

2. False

Q.

Explain using a neat diagram the experiment conducted by J J Thomson in 1897 that led to the discovery of electrons.