Cathode Ray Experiment

Q.

Name The Scientist Who Discovered Electron.

Q.

What is the mass of electrons in grams?

Q. What is the difference between anode rays and cathode rays?

Q. Light of wavelength 4000 Angstrom falls on the surface of cesium. Calculate the energy of the photoelectron emitted. The critical wavelength for photoelectric effect in cesium is 6600 Angstrom.

Q.

Which of the following are properties of anode rays?

1. Anode rays deflect towards negatively charged plate

2. Anode rays travel along a straight path in absence of electric and magnetic field

3. Anode rays are positively charged radiations due to positive charged sub-atomic particles

4. All of these

Q.

Why were anode rays also called as 'canal rays'?

Q.

Question 1
What are canal rays?

Q.

How do cathode rays differ from anode rays ?

Q.

Why was Thomson’s Model of an atom failed?

i. It could not explain the screening of negative charges from that of positive

ii. It did not tell about the presence of electrons

iii. It did not give an idea about the position of the nucleus

iv. It explained the atom as a whole to be electrically neutral.

1. Only (iii)
2. 
   

   Both (i) & (iii)

3. 
   

   Only (i)

4. 
   

   Both (ii) & (iv)

Q. A current of 4 ampere was passed for 1.5 hours through a solution of copper sulphate when 3.2g of copper was deposited.calculate the current effeciency.

Q.

Define stopping potential.

Q.

(a) What are the cathode rays? What is the nature of charge on cathode rays?
(b) Explain how cathode rays are formed from the gas taken in the discharge tube.
(c) What conclusion is obtained from the fact that all the gases form cathode rays?

Q.

Mention the characteristics of anode rays.

Q.

(a) What is the nature of charge on cathode rays?

(b) State the properties of cathode rays.

Q.

Define anode rays?

Q.

How are X-rays produced?

Q.

State three properties of a positive ray.

Q.

What are the three main parts of a hot cathode ray tube?

Q.

What is the speed of light?

Q. Which gas was filled in discharge tube by JJ Thomson when he discovered electrons?

Q.

Cathode Rays travels from Anode to Cathode.

1. True

2. False

Q.

An electron is accelerated from rest through a potential different $V$. Its final speed is proportional to

1. $V$

2. $V^2$

3. $\sqrt{V}$

4. $\frac{1}{\sqrt{V}}$

Q.

State whether the following statements are true or false:
(a) Thomson proposed that the nucleus of an atom contains protons and neutrons.
(b) The cathode rays obtained from all the gases consist of negetively charged particles called electrons.
(c) The anode rays obtained from all the gases consist of positively charged particles called protons.

Q. ntCathode rays are moving between the poles of a magnet .Due to the effect of magnetic field of a magnetn nt1, velocity of rays increasesn nt2, velocity of rays decreasesn nt3, rays deflected towards south polen nt4, rays deflected in upward direction and perpendicular to plane of the papern

Q.

Is the positive terminal of a battery known as cathode and are anode rays positively charged?

Q.

Which of the following is not true for cathode rays?

1. Cathode rays consist of negatively charged particles.

2. Nature of cathode rays depend upon the nature of the gas in discharge tube.

3. Cathode rays are produced inside the discharge tube.

4. Cathode rays were discovered by J.J Thomson.

Q. A total charge of 5 micro coulomb is distributed uniformly on the surface of the thin walled hemispherical cup. If the electric field strength at the centre of the hemisphere is 9*108 n/c, then the radius of the cup is?

Q.

Differentiate between canal rays and cathode rays.

Q.

What are the cathode rays? How are these rays formed?

Q. Cathode rays were discovered by

1. J. J. Thomson
2. Heinrich Hertz
3. William Crookes
4. Maxwell Clerk James