In the following diagram if V2>V1, then,

(1) λ1=λ2

(2) λ1<λ2

(3) λ1=λ2

(4) λ1>λ2

Subtopic:  Photoelectric Effect: Experiment |
 69%
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A point source of light is used in an experiment on photoelectric effects. Which of the following curves best represents the variation of photocurrent \((i)\) with distance \((d)\) of the source from the emitter?

   

1. \(a\) 2. \(b\)
3. \(c\) 4. \(d\)
Subtopic:  Photoelectric Effect: Experiment |
 60%
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The stopping potential \((V_{0})\) versus frequency \((\nu_{0})\) plot of a substance is shown in the figure. What will be the threshold wavelength?    
         

1. \(5 \times 10^{14}~ \text{m}\) 2. \(6000~\mathring{A}\)
3. \(5000~\mathring{A}\) 4. Cannot be estimated from given data
Subtopic:  Photoelectric Effect: Experiment |
 59%
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Figure represents a graph of kinetic energy (K) of photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is

1. 1 eV

2. 1.5 eV

3. 2 eV

4. 3 eV

Subtopic:  Einstein's Photoelectric Equation |
 83%
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The graph that correctly represents the relation of frequency v of a particular characteristic X-ray with the atomic number Z of the material is

Subtopic:  X-Ray (OLD NCERT) |
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The dependence of the short wavelength limit λmin on the accelerating potential V is represented by the curve of figure:

1. A
2. B
3. C
4. None of these

Subtopic:  Photoelectric Effect: Experiment |
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The curves (a), (b) (c) and (d) show the variation between the applied potential difference (V) and the photoelectric current (i), at two different intensities of light ( I1>I2). In which figure is the correct variation shown ?

Subtopic:  Photoelectric Effect: Experiment |
 90%
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Assertion : The energy (E) and momentum (p) of a photon are related by p=E/c .
Reason : The photon behaves like a particle.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Particle Nature of Light |
 64%
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Assertion : Photoelectric effect demonstrates the wave nature of light.
Reason : The number of photoelectrons is proportional to the frequency of light.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Particle Nature of Light |
 64%
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Assertion : When the speed of an electron increases its specific charge decreases.
Reason : Specific charge is the ratio of the charge to mass.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Particle Nature of Light |
 54%
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