- AOnly on the intensity of light
- ✓On both the frequency of light and the distance between the source and the metal.
- COn the work function of metal
- DAll of the above
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According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is
(a)
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(b)
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(c)
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(d)
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The capacity of a parallel plate condenser is 15μF, when the distance between its plates is 6 cm. If the distance between the plates is reduced to 2 cm, then the capacity of this parallel plate condenser will be
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(a) 15 μF |
(b) 30 μF |
(c) 45 μF |
(d) 60 μF |
At any instant the ratio of the amount of radioactive substances is 2 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances
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(a) 1 : 1 |
(b) 2 : 1 |
(c) 1 : 2 |
(d) 1 : 4 |
Half life of a radioactive element is 10 days. The time during which quantity remains 1/10 of initial mass will be
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(a) 100 days |
(b) 50 days |
(c) 33 days |
(d) 16 days |