Monochromatic light of frequency \(6.0\times 10^{14}~\text{Hz}\) is produced by a laser. The power emitted is \(2.0\times 10^{-3}~\text{W}\). How many photons per second, on average, are emitted by the source?
1. \(6\times 10^{15}\)
2. \(5\times 10^{14}\)
3. \(6\times 10^{14}\)
4. \(5\times 10^{15}\)

Subtopic:  Particle Nature of Light |
 68%
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The work function of cesium is \(2.14\) eV. The threshold frequency for cesium is:
1. \(5.03\times10^{12}\) Hz
2. \(6.12\times10^{14}\) Hz
3. \(5.16\times10^{14}\) Hz
4. \(6.51\times10^{12}\) Hz

Subtopic:  Particle Nature of Light |
 68%
From NCERT
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The work function of caesium is \(2.14~\text{eV}\). The wavelength of incident light if the photocurrent is brought to zero by a stopping potential of \(0.60~\text{V}\) will be:
1. \(454~\text{nm}\)
2. \(440~\text{nm}\)
3. \(333~\text{nm}\)
4. \(350~\text{nm}\)

Subtopic:  Einstein's Photoelectric Equation |
 61%
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The wavelength of light in the visible region is about 390 nm for violet colour. The energy of photons in (eV) is:
(Take \(h=6.63\times 10^{-34}~\mathrm{Js}\) and \(1\mathrm{eV}=1.6\times 10^{-19}~\mathrm{J}\))


1. 1.64 eV
2. 2.26 eV
3. 3.19 eV
4. 4.03 eV

Subtopic:  Photoelectric Effect: Experiment |
 73%
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What is the de-Broglie wavelength associated with an electron moving at a speed of \(5.4\times10^6~\text{m/s}\)?
1. \(0.244~\text{nm}\)
2. \(0.135~\text{nm}\)
3. \(0.157~\text{nm}\)
4. \(0.111~\text{nm}\)

Subtopic:  De-broglie Wavelength |
 68%
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The de Broglie wavelength associated with a ball of mass 150 g travelling at a speed of 30.0 m/s is:

1. 1.47×10-32 m
2. 2.01×10-34 m
3. 2.01×10-32 m
4. 1.47×10-34 m

Subtopic:  De-broglie Wavelength |
 66%
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An electron, an α-particle, and a proton have the same kinetic energy. Which of these particles has the shortest de Broglie wavelength?

1. Electron

2. α-particle

3. proton

4. All have the same de Broglie wavelength

Subtopic:  De-broglie Wavelength |
 75%
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A particle is moving three times as fast as an electron. The ratio of the de Broglie wavelength of the particle to that of the electron is 1.813×10-4. The particle’s mass is:

1. 9.371×10-31 kg
2. 9.001×10-31 kg
3. 1.675×10-27 kg
4. 2.705×10-27 kg

Subtopic:  De-broglie Wavelength |
 65%
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What is the de Broglie wavelength associated with an electron, accelerated through a potential difference of \(100\) V?
1. \(0.123\) nm
2. \(0.232\) nm
3. \(0.031\) nm
4. \(0.312\) nm

Subtopic:  De-broglie Wavelength |
 77%
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The wavelength of light in the visible region is about \(550\) nm (average wavelength) for yellow-green colour. Three materials with work functions are given as Al (\(4.28\) eV), Cu (\(4.65\) eV) and Na (\(2.75\) eV). From which of these photosensitive materials, can you build a photoelectric device that operates with visible light?
1. Al
2. Cu
3. Na
4. none of the above

Subtopic:  Photoelectric Effect: Experiment |
 51%
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