Dual Nature of Matter and RadiationEinstein's Photoelectric Equation (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 1  4 of 11
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Question number: 1
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Question
The separation between Bragg’s planes in a crystal is 10 Å. Then the wavelength of those Xrays which can be diffracted by this crystal is
(1) 5 Å (2) 10 Å
(3) 20 Å (4) 25 Å
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  2 and 4 are correct 

c.  1 and 3 are correct 

d.  1, 2 and 3 are correct 

Question number: 2
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Question
An electromagnetic radiation of frequency 3 × 10 ^{15} cycles per second falls on a photo electric surface whose work function is 4.0 eV Find out the maximum velocity of the photo electrons emitted by the surface
Choices
Choice (4)  Response  

a.  1.73 × 10 ^{6 } m/s 

b.  13.4 × 10 ^{19 } m/s 

c.  19.8 × 10 ^{19 } m/s 

d.  Question does not provide sufficient data or is vague 

Question number: 3
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Question
Ultraviolet light of wavelength 280 nm is used in an experiment on photo electric effect with lithium (Φ = 2.5 eV) cathode.
(1) The maximum kinetic energy is 1.9 eV
(2) The stopping potential is 1.9 V
(3) The maximum kinetic energy is 4.4 V
(4) The stopping potential is 4.4 eV
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 3 are correct 

b.  2 and 4 are correct 

c.  1, 2 and 3 are correct 

d.  1 and 2 are correct 

Question number: 4
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Assertion (Ꭺ)
Photosensitivity of a metal is large if its work function is small.
Reason (Ꭱ)
Work function = hf _{0. } where f _{0} is the threshold frequency.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

b.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

c.  Ꭺ is true but Ꭱ is false 

d.  Ꭺ is false but Ꭱ is true 
