  Types Of Questions

## Dual Nature Of Radiation And Matter

- Wondering what kind of questions that can be asked in next exam? Here you go!
1

### Single Correct

A proton is fired from very far away towards a nucleus with charge Q = 120 e, where e is the electronic charge. It makes a closest approach of 10 fm to the nucleus. The de Broglie wavelength (in units of fm) of the proton at its start is :

(take the proton mass, and

)
A
B
C
D
A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30and the speed of light is . The final momentum of the object is:
A
B
C
D
The work functions of Silver and Sodium are 4.6 and 2.3 eV, respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is
A
1
B
0.33
C
0.67
D
1.33
A metal surface is illuminated by light of two different wavelengths and . The maximum speeds of the photoelectrons corresponding to these wavelengths are and , respectively. If the ratio and , the work function of the metal is nearly :
A
B
C
D
2
Multiple Correct
The graph between and stopping potential (V) of three metals having work functions and in an experiment of photo-electric effect is plotted as shown in the figure. Which of the following statement(s)  correct? [Here is the wavelength of the incident ray].
This question has multiple correct options
A
Ratio of work functions : : : 2 : 4
B
Ratio of work functions : : : 2 : 1
C
is directly proportional to , where is Planck's constant and is the speed of light.
D
The violet colour light can eject photoelectrons from metals 2 and 3.
3
Numerical Type I
An -particle and a proton are accelerated from rest by a potential difference of . After this, their de Broglie wavelengths are and respectively. The ratio , to the nearest integer, is: