# Light of wavelength $$3000 ~{\mathring{\mathrm{A}}}$$ in Photoelectric effect gives electron of maximum kinetic energy $$0.5 ~\text{eV}$$. If the wavelength changes to $$2000 ~{\mathring{\mathrm{A}}}$$ then the maximum kinetic energy of emitted electrons will be: 1. less than $$0.5 ~\text{eV}$$ 2. $$0.5 ~\text{eV}$$ 3. greater than $$0.5 ~\text{eV}$$ 4. the photoelectric effect does not occur

Subtopic:  Einstein's Photoelectric Equation |
82%
From NCERT
AIPMT - 1999
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If the K.E. of an electron and a photon is the same, then the relation between their de-Broglie wavelength will be:

1. ${\lambda }_{ph}$ $<$ ${\lambda }_{e}$

2. ${\lambda }_{ph}$ $=$ ${\lambda }_{e}$

3. ${\lambda }_{ph}$ $>$ ${\lambda }_{e}$

4. ${\lambda }_{ph}$ $=2$ ${\lambda }_{e}$

Subtopic:  De-broglie Wavelength |
52%
From NCERT
AIPMT - 1999
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The total energy of an electron is $$3.555~\text{MeV}$$. Its kinetic energy will be:
1.  $$3.545~\text{MeV}$$
2.  $$3.045~\text{MeV}$$
3.  $$3.5~\text{MeV}$$
4.  none of the above

Subtopic:  Electron Emission |
From NCERT
AIPMT - 1999
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The value of Planck's constant is:

1. $6.63×{10}^{-34}$ $\mathrm{J}/\mathrm{s}$

2. $6.63×{10}^{-34}$ $\mathrm{kg}-{\mathrm{m}}^{2}/\mathrm{s}$

3. $6.63×{10}^{-34}$ $\mathrm{kg}-{\mathrm{m}}^{2}$

4.

Subtopic:  Einstein's Photoelectric Equation |
58%
From NCERT
AIPMT - 2002
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If particles are moving with the same velocity, then the de-Broglie wavelength is maximum for:
1. proton
2. $$\alpha-$$particle
3. neutron
4. $$\beta-$$particle

Subtopic:  De-broglie Wavelength |
62%
From NCERT
AIPMT - 2002
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When ultraviolet rays strike a metal plate, the photoelectric effect does not occur. It occurs by the incidence of:

1. Infrared rays

2. X-rays

4. Lightwave

Subtopic:  Photoelectric Effect: Experiment |
66%
From NCERT
AIPMT - 2002
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Which of the following is not the property of cathode rays:

 1 it produces a heating effect. 2 it does not deflect in the electric field. 3 it casts a shadow. 4 it produces fluorescence.
Subtopic:  Electron Emission |
67%
From NCERT
AIPMT - 2002
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Which one among the following shows the particle nature of light?
1. Photoelectric effect
2. Interference
3. Refraction
4. Polarisation

Subtopic:  Particle Nature of Light |
90%
From NCERT
AIPMT - 2001
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A photo-cell is illuminated by a source of light, which is placed at a distance $$d$$ from the cell. If the distance becomes $$\frac{d}{2}$$, then the number of electrons emitted per second will be:
1. same
2. four times
3. two times
4. one-fourth

Subtopic:  Photoelectric Effect: Experiment |
71%
From NCERT
AIPMT - 2001
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A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then:

 1 each emitted electron carries one-quarter of the initial energy 2 number of electrons emitted is half the initial number 3 each emitted electron carries half the initial energy 4 number of electrons emitted is a quarter of the initial number
Subtopic:  Photoelectric Effect: Experiment |
66%
From NCERT
AIPMT - 2003
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