Dual Nature of Matter and Radiation (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 1  5 of 39
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Question number: 1
» Dual Nature of Matter and Radiation » Hertz and Lenard's Observations
Question
Assertion (Ꭺ)
Unit of Rydberg constant R is ml
Reason (Ꭱ)
It follows from Bohr’s formula v = R [

] the symbols have their usual meaning.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

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

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are false 

Question number: 2
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
One electron & one proton is accelerated by equal potential. Ratio of their deBroglie wavelengths is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 3
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
A photon and an electron have equal energy E. is proportional to
Choices
Choice (4)  Response  

a. 


b.  Not depend upon E 

c. 


d. 


Question number: 4
» 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: 5
» 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.  13.4 × 10 ^{19 } m/s 

b.  19.8 × 10 ^{19 } m/s 

c.  1.73 × 10 ^{6 } m/s 

d.  All of the above 
