If v 2 = x v 1, the value of x will be _. When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes v 2. When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is v1. The energy released in this process is _ MeV. The binding energies per nucleon for respectively. Two lighter nuclei combine to form a comparatively heavier nucleus by the relation given below : The minimum time, after which it would be possible to work safely with source, will be _ hours. A freshly prepared radioactive source of half life 2 hours 30 minutes emits radiation which is 64 times the permissible safe level. The change in average intensities of visible radiation, at a distance of 1 m from the bulb to a distance of 5 m is a×10 −2 W/m 2. Nearly 10% of the power of a 110 W light bulb is converted to visible radiation.
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