Dual Nature of Matter and Radiation (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 25  30 of 36
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Question number: 25
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Assertion (Ꭺ)
The deBroglie wavelength of a molecule varies inversely as the square root of temperature.
Reason (Ꭱ)
The root mean square velocity of the molecule is proportional to square root of absolute temperature.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

b.  Ꭺ is true but Ꭱ is false 

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

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

Question number: 26
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
Slope of curve is
(Where, V _{0} = Stopping potential and ν = frequency)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 27
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Question
The work function for the surface of aluminum is 4.2 eV. What will be the wavelength of that incident light for which the stopping potential will be 0? (h = 6.6 ×10 ^{34} Js, e = 1.6 × 10 ^{19})
Choices
Choice (4)  Response  

a.  2946 Å 

b.  2496 Å 

c.  2649 Å 

d.  2946 × 10 ^{7} m 

Question number: 28
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
The ratio of wavelength of deuteron & proton accelerated by an equal potential is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Passage
A physicist wishes to eject electrons by shining light on a metal surface. The light source emits light of wavelength of 450 nm. The table lists the only available metals and their work functions.
Metal  W _{0} (eV) 
Barium  2.5 
Lithium  2.3 
Tantalum  4.2 
Tungsten  4.5 
Question number: 29 (1 of 3 Based on Passage) Show Passage
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Question
Which option correctly identifies the metal that will produce the most energetic electrons and their energies?
Choices
Choice (4)  Response  

a.  Lithium, 2.30 eV 

b.  Tungsten, 1.75 eV 

c.  Lithium, 0.45 eV 

d.  Tungsten, 2.75 eV 

Question number: 30 (2 of 3 Based on Passage) Show Passage
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Question
Suppose photoelectric experiment is done separately with these metals with light of wavelength 450 nm. The maximum magnitude of stopping potential amongst all the metals is
Choices
Choice (4)  Response  

a.  0.45 volt 

b.  4.5 volt 

c.  2.75 volt 

d.  0.25 volt 
