# The de-Broglie wavelength associated with a ball of mass $$150~\text{g}$$ travelling at a speed of $$30.0~\text{m/s}$$ is: 1. $$1.47\times10^{-32}~\text{m}$$ 2. $$2.01\times10^{-34}~\text{m}$$ 3. $$2.01\times10^{-32}~\text{m}$$ 4. $$1.47\times10^{-34}~\text{m}$$

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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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 |
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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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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 |
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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 |
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Monochromatic light of frequency $$6.0\times 10^{14}~\text{Hz}$$ is produced by a laser. The power emitted is $$2.0\times 10^{-3}~\text{W}$$$\mathrm{}.$ 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 |
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