- AThe nucleus is of infinite mass and is at rest
- BElectron in a quantized orbit will not radiate energy
- CMass of the electron remains constant
- DAll of the above
Explanation:
Bohr's Assumption:
Electron in atoms orbit the nucleus.
Electron in a quantized orbit will not radiate energy.
Electrons can only gain and lose energy by jumping from one allowed orbit to other.
He also assumed one of the postulates of Rutherford's atomic model, that is, the mass of the nucleus is very large compared to that of the electrons and hence assumed to be infinite.
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In the forward bias arrangement of a PN-junction diode
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(a) The N-end is connected to the positive terminal of the battery |
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(b) The P-end is connected to the positive terminal of the battery |
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(c) The direction of current is from N-end to P-end in the diode |
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(d) The P-end is connected to the negative terminal of battery |
Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be
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(a) |
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(c) |
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The observed wavelength of light coming from a distant galaxy is found to be increased by 0.5% as compared with that coming from a terrestrial source. The galaxy is
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(a) Stationary with respect to the earth |
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(b) Approaching the earth with velocity of light |
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(c) Receding from the earth with the velocity of light |
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(d) Receding from the earth with a velocity equal to 1.5 |

A solid metallic sphere has a charge +3Q. Concentric with this sphere is a conducting spherical shell having charge -Q. The radius of the sphere is a and that of the spherical shell is b(b > a). What is the electric field at a distance R(a < R < b) from the centre
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(a) |
(b) |
(c) |
(d) |