X-rays when incident on a meta
|
(a) Exert a force on it |
(b) Transfer energy to it |
|
(c) Transfer pressure to it |
(d) All of the above |
X-rays when incident on a meta
|
(a) Exert a force on it |
(b) Transfer energy to it |
|
(c) Transfer pressure to it |
(d) All of the above |
(d) All of the above
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Which of the following (referred to a spherical mirror) do (does) not depend on whether the rays are paraxial or not?
A 1mA beam of protons with a cross-sectional area of 0.5 sq. mm is moving with a velocity of 3
. Then charge density of beam is
|
(a) 6.6 |
(b) 6.6 |
(c) 6.6 |
(d) None of these |

Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e.
. If
are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct

|
(a) |
(b) |
(c) |
(d) |
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
|
(a) Sky wave |
(b) Ground wave |
(c) Sea wave |
(d) Both (a) and (b) |