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Dual Nature of Matter Test 03 Class 12 Notes | EduRev

Class 12 : Dual Nature of Matter Test 03 Class 12 Notes | EduRev

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CBSE TEST PAPER-03 
CLASS - XII PHYSICS (Dual Nature of Matter and Radiation) 
1. How does the stopping potential applied to a photocell change if the distance
between the light source and the cathode of the cell is doubled?
[1] 
2. On what factor does the retarding potential of a photocell depend?
[1] 
3. Electron and proton are moving with same speed, which will have more
wavelength?
[1] 
4. By how much would the stopping potential for a given photosensitive surface go up
if the frequency of the incident radiations were to be increased from 4× 10
15
 Hz to 8
× 10
15 
Hz? 
( )
3 19 8
6.4 10 4 , 1.6 10 , 3 10 / h Js e C c m s
- - = × = × = ×
[2] 
5. Work function of Na is 2.3eV. Does sodium shoe photoelectric emission for light on
the velocity of photoelectrons?
[2] 
6. An electron and an alpha particle have the same debroglie wavelength associated
with them? How are their kinetic energies related to each other?
[2] 
7. An particle a - and a proton are accelerated from rest through same potential
difference V. find the ratio of de–broglie wavelength associated with them?
[2] 
8. Photoelectric work function of a metal is 1eV. Light of wavelength 3000A
o
 falls on it.
What is the velocity of the effected photoelectron?
[3] 
9. The wavelength ? of a photon and debroglie wavelength of an electron have the
same value. Show that the energy of the photon is 
2 mc
h
?
 times the kinetic energy of 
electron where m, c, and h have their usual meanings? 
[3] 
10. Draw a graph showing the variation of stopping potential with frequency of the
incident radiations. What does the slope of the line with the frequency axis indicate.
Hence define threshold frequency?
[3]

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