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 |
 66%
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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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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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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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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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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