Explanation:
Velocity of a wave is given by:
$\text{v}=\frac{\text{E}}{\text{B}}$
Hence wave velocity change in both the cases.
Frequency of the wave remains the same.
Using $\text{v}=\text{f}\lambda,$ it can be concluded that both $\lambda_1$ and $\lambda_2$ are variable.
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When subjected to a transverse electric field, cathode rays move
|
(a) Down the potential gradient |
(b) Up the potential gradient |
|
(c) Along a hyperbolic path |
(d) Along a circular path |
A semiconductor dopped with a donor impurity is
|
(a) P-type |
(b) N-type |
(c) NPN type |
(d) PNP type |
A lens is placed between a source of light and a wall. It forms images of area 
and 
on the wall for its two different positions. The area of the source or light is
|
(a) |
(b) |
(c) |
(d) |
The kinetic energy of an electron revolving around a nucleus will be
| (a) Four times of P.E. | (b) Double of P.E. | (c) Equal to P.E. | (d) Half of its P.E. |
If the distance between a point source and screen is doubled, then intensity of light on the screen will become
|
(a) Four times |
(b) Double |
(c) Half |
(d) One-fourth |
