# 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 $$6.63\times 10^{-34}~\text{J/s}$$ 2 $$6.63\times 10^{-34}~\text{kg-}\text{m}^2\text{/s}$$ 3 $$6.63\times 10^{-34}~\text{kg-}\text{m}^2$$ 4 $$6.63\times 10^{-34}~\text{J-s}^2$$
Subtopic:  Einstein's Photoelectric Equation |
59%
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. $$\alpha\text-$$particle
3. neutron
4. $$\beta\text-$$particle

Subtopic:  De-broglie Wavelength |
63%
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

3. Radio wave

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 $$\dfrac{d}{2}$$, 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 |
70%
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 |
67%
From NCERT
AIPMT - 2003
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J.J. Thomson's cathode-ray tube experiment
demonstrated that:
 1 cathode rays are streams of negatively charged ions. 2 all the mass of an atom is essentially in the nucleus. 3 the $$\frac{e}{m}$$ of electrons is much greater than the $$\frac{e}{m}$$ of protons. 4 the $$\frac{e}{m}$$ ratio of the cathode ray particles changes when a different gas is placed in the discharge tube.
Subtopic:  Electron Emission |
53%
From NCERT
AIPMT - 2003
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