Q. No.
Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be
1. 1:2
2. 1:1
3. 1:5
4. 1:4
1. 1:2
2. 1:1
3. 1:5
4. 1:4
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| 1. | decrease by \(2\) times |
| 2. | decrease by \(4\) times |
| 3. | increase by \(4\) times |
| 4. | increase by \(2\) times |
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| 1. | \(1.00\) | 2. | \(1.02\) |
| 3. | \(1.04\) | 4. | \(0.98\) |
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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be
1. 2.4 V
2. -1.2 V
3. -2.4 V
4. 1.2 V
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2. 3 X 1016
3. 9 x 1015
4. 3 X 1019
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2. Curves a and b represent incident radiations of the same frequency but of different intensities
3. Curves b and c represent incident radiations of different frequencies and different intensities
4. Curves b and c represent incident radiations of same frequency having the same intensity
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2. threshold frequency (0)
3. intensity of light
4. frequency of light ()
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1. ultraviolet region
2. visible region
3. infrared region
4. X-ray region
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A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 x 106 ms-1. The velocity of the particle is :
(Mass of electron = 9.1 x 10-31 kg)
1.
2.
3.
4.
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1. \(5\times 10^{15}\)
2. \(5\times 10^{16}\)
3. \(5\times 10^{17}\)
4. \(5\times 10^{14}\)
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