Q. No.
The wavelength λe of an electron and λP of a photon of same energy E are related by :
1. λP ∝ λe
2. λP ∝
3. λP ∝
4. λP ∝ λe2
2. λP ∝
3. λP ∝
4. λP ∝ λe2
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1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
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An -particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de-Broglie wavelength associated with the particle will be :
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In the Davison and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
1. increasing the filament current
2. decreasing the filament current
3. decreasing the potential difference between the anode and filament
4. increasing the potential difference between the anode and filament
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A radioactive nucleus of mass M emits a photon of frequency and the nucleus will recoil. The recoil energy will be
1.
2. zero
3.
4.
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1. \(1.3\) V
2. \(0.5\) V
3. \(2.3\) V
4. \(1.8\) V
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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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