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?
Therefore, by finding the value of e and slope of graph we can find the Plank’s constant K.
Plank’s constant, K = Slope of graph x e
(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.