A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be
|
(a) M/A |
(b) AIM |
(c) MA |
(d) |
(a) M/A
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The activity of a sample is 64 × 10–5 Ci. Its half-life is 3 days. The activity will become 5 × 10–6 Ci after
|
(a) 12 days |
(b) 7 days |
(c) 18 days |
(d) 21 days |
Two slits are separated by a distance of 0.5 mm and illuminated with light of λ = 6000 Å. If the screen is placed 2.5 m from the slits. The distance of the third bright image from the centre will be
|
(a) 1.5 mm |
(b) 3 mm |
(c) 6 mm |
(d) 9 mm |
The image formed by a concave mirror:
The energy of a photon of wavelength 
is given by
|
(a) h |
(b) ch |
(c) |
(d) |
Decay constant of radium is λ. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
|
(a) λ |
(b) More than λ |
(c) Less than λ |
(d) Zero |
