- A1 × 1018 to 3 × 1022 Hz
- B3 × 10-18 to 5 × 1022 Hz
- C3 × 1018 to 5 × 1022 Hz
- D3 × 10-18 to 5 × 10-22 Hz
Explanation:
The frequency range of Gamma rays is 3 × 1018 to 5 × 1022 Hz. These rays have a wavelength of 6 × 10-13 to 10-10m. Gamma rays are produced in nuclear reactions and are also emitted by radioactive nuclei.
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Two equal charges q of opposite sign separated by a distance 2a constitute an electric dipole of dipole moment p. If P is a point at a distance r from the centre of the dipole and the line joining the centre of the dipole to this point makes an angle θ with the axis of the dipole, then the potential at P is given by (r >> 2a) (Where p = 2qa)
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(a) |
(b) |
(c) |
(d) |
Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.
Reason : In Young’s double slit experiment, fringe width is given by relation B =
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
When Ge crystals are doped with phosphorus atom, then it becomes
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(a) Insulator |
(b) P-type |
(c) N-type |
(d) Superconductor |

The frequency of 1st line of Balmer series in atom is
. The frequency of line emitted by singly ionised He atom is
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(a) 2 |
(b) 4 |
(c) |
(d) |
A capacitor of 10mF charged up to 250 volts is connected in parallel with another capacitor of 5mF charged up to 100 volts. The common potential is
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(a) 500 V |
(b) 400 V |
(c) 300 V |
(d) 200 V |