Rutherford's Observations

Q. Which of the following graphs shows the variation of photoelectric current (I) with voltage (V) between the electrodes in a photo-electric cell?

1. 
   
2. 
   
3. 
   
4. 
   

Q.

In the Photoelectric setup, I would like to achieve stopping potential by making one of the plates in the setup, positively charged. Which one should I charge positively?

1. The collector plate

2. The emitter plate

3. Stopping potential cannot be achieved by making any plate positively charged

4. More data is required to make a selection

Q. If number of scattering particles are 56 for ${90}^{\circ }$ angle then the number of scattering particles at ${60}^{\circ }$ angle will be

1. 224
2. 256
3. 98
4. 108

Q. Three particles, each having a charge of $10\mu \text{C}$ are placed at the vertices of an equilateral triangle of side $10\text{cm}$. Find the work done by a person in pulling them apart to infinite separation.

1. $0\text{J}$
2. $27\text{J}$
3. $-54\text{J}$
4. $-27\text{J}$

Q. The size of the atom in Thomson’s model is the atomic size in Rutherford’s model.

1. much greater than
2. no different from
3. much less than

Q. If number of scattering particles are 56 for ${90}^{\circ }$ angle then the number of scattering particles at ${60}^{\circ }$ angle will be

1. 224
2. 256
3. 98
4. 108

Q. Where strong force is greater. 1.between neutron and neutron 2. between neutron and proton 3. between proton and proton

Q. A proton, a deuteron and an $\alpha -particle$ with the same kinetic energy enters a region of uniform magnetic field moving at right angles to $B$. What is the ratio of the radii of their circular paths :

Q. $\alpha$ particles used in Rutherford's experiments are heavy particles.

1. positively charged
2. negatively charged
3. neutral