- A$E _1=2 E _2$
- B$E _1> E _2$
- ✓$E _2> E$
- D$E _2=2 E _1$
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Assertion : Electron has higher mobility than hole in a semiconductor.
Reason : Mass of electron is less than the mass of hole.
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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. |
An electron is moving with a speed of perpendicular to a uniform magnetic field of intensity B. Suddenly intensity of the magnetic field is reduced to B/2. The radius of the path becomes from the original value of r
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(a) No change |
(b) Reduces to r / 2 |
(c) Increases to 2r |
(d) Stops moving |
When the electron in the hydrogen atom jumps from 2nd orbit to 1st orbit, the wavelength of radiation emitted is 𝜆. When the electrons jump from 3rd orbit to 1st orbit, the wavelength of emitted radiation would be
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(a) |
(b) |
(c) |
(d) |
A current carrying loop is free to turn in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at
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(a) 0° to the direction of the field |
(b) 45 ° to the direction of the field |
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(c) 90° to the direction of the field |
(d) 135° to the direction of the field |
The central point of a spherical mirror is called:
The capacitance of a parallel plate capacitor is 12μF. If the distance between the plates is doubled and area is halved, then new capacitance will be
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(a) 8μF |
(b) 6μF |
(c) 4μF |
(d) 3μF |
The magnetic field of earth is due to
| (a) Motion and distribution of some material in and outside the earth |
| (b) Interaction of cosmic rays with the current of earth |
| (c) A magnetic dipole buried at the centre of the earth |
| (d) Induction effect of the sun |