An astronomical telescope consists of two convex lenses having focal length 80 cm and 4 cm. When it is in normal adjustment, what is its:
(i) Length,
(ii) Magnifying power?
(i) Define ‘unified atomic mass unit’.
(ii) Find the minimum energy which a gamma ray photon should possess so that it is capable of producing an electron — positron pair.
Energy released per fission = 200 MeV.
= (200 x 106) x 1.6 x 10-19J
Now 320 MW = 320 x 106 Js
Therefore,
No. of fission per second =