- ARefracted
- BTransmitted
- CReflected
- DEmitted
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The current flowing in a copper voltameter is 1.6 A. The number of ions deposited at the cathode per minute are
|
(a) 1.5 |
(b) 3 |
(c) 6 |
(d) 1 |
Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
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(a) 0 eV |
(b) 1 eV |
(c) 2 eV |
(d) 10 eV |
For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
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(a) Potentiometer is more sensitive than voltmeter |
|
(b) The resistance of potentiometer is less than voltmeter |
|
(c) Potentiometer is cheaper than voltmeter |
|
(d) Potentiometer does not take current from the circuit |
When light is refracted from air into glass
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(a) Its wavelength and frequency both increase |
|
(b) Its wavelength increases but frequency remains unchanged |
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(c) Its wavelength decreases but frequency remains unchanged |
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(d) Its wavelength and frequency both decrease |
A rocket is going towards moon with a speed v. The astronaut in the rocket sends signals of frequency v towards the moon and receives them back on reflection from the moon. What will be the frequency of the signal received by the astronaut (Take v << c)
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(a) |
(b) |
(c) |
(d) |