A photon in motion has a mass
|
(a) c/hv |
(b) h/v |
(c) hv |
(d) |
A photon in motion has a mass
|
(a) c/hv |
(b) h/v |
(c) hv |
(d) |
(d)
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A 100 watt bulb working on 200 volt and a 200 watt bulb working on 100 volt have
|
(a) Resistances in the ratio of 4 : 1 |
|
(b) Maximum current ratings in the ratio of 1 : 4 |
|
(c) Resistances in the ratio of 2 : 1 |
|
(d) Maximum current ratings in the ratio of 1 : 2 |
A radioactive sample is a-emitter with half life 138.6 days is observed by a student to have 2000 disintegration/sec. The number of radioactive nuclei for given activity are
|
(a) 3.45 × 1010 |
(b) 1 × 1010 |
(c) 3.45 × 1015 |
(d) 2.75 × 1011 |
In the given circuit, the voltmeter records 5 volts. The resistance of the voltmeter in ohms is
|
(a) 200 |
(b) 100 |
(c) 10 |
(d) 50 |