Monochromatic light of frequency  is produced by a laser. The power emitted is  How many photons per second, on average, are emitted by the source?





Subtopic:  Particle Nature of Light |
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The work function of caesium is 2.14 eV. The threshold frequency for caesium is:

Subtopic:  Particle Nature of Light |
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The work function of caesium is 2.14 eV. The wavelength of incident light if the photocurrent is brought to zero by a stopping potential of 0.60 V will be:

1. 454 nm

2. 440 nm

3. 333 nm

4. 350 nm

Subtopic:  Einstein's Photoelectric Equation |
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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 |
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What is the de-Broglie wavelength associated with an electron moving at a speed of

1. 0.244 nm

2. 0.135 nm

3. 0.157 nm

4. 0.111 nm

Subtopic:  De-broglie Wavelength |
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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:

Subtopic:  De-broglie Wavelength |
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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. $\alpha$-particle

3. proton

4. All have the same de Broglie wavelength

Subtopic:  De-broglie Wavelength |
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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:

Subtopic:  De-broglie Wavelength |
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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 |
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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 |
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