Dual Nature of Matter and Radiation (NEET Physics): Questions 25  28 of 34
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Question number: 25
» Dual Nature of Matter and Radiation » Photoelectric Effect
Question
The figure shows the variation of photocurrent with anode potential for a photosensitive surface for three different radiations. Let I _{a}, I _{b} and I _{c}, be the intensities and f _{a}, f _{b} and f _{c } be the frequencies for the curves a, b and c respectively. Then,
Choices
Choice (4)  Response  

a. 
 
b. 
 
c.  f a = f c & I a = I c  
d. 

Question number: 26
» 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: 27
» 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: 28
» 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 