Compton effect shows that
|
(a) X-rays are waves |
(b) X-rays have high energy |
|
(c) X-rays can penetrate matter |
(d) Photons have momentum |
Compton effect shows that
|
(a) X-rays are waves |
(b) X-rays have high energy |
|
(c) X-rays can penetrate matter |
(d) Photons have momentum |
(d) Photons have momentum
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In hydrogen spectrum the wavelength of
line is 656 nm whereas in the spectrum of a distant galaxy,
line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is
|
(a) 2 |
(b) 2 |
(c) 2 |
(d) 2 |

The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (Fig). Which of the four rays correctly shows the direction of reflected ray?

The mobility of free electron is greater than that of free holes because
|
(a) The carry negative charge |
|
(b) They are light |
|
(c) They mutually collide less |
|
(d) They require low energy to continue their motion |
What will be the colour of sky as seen from the earth, if there were no atmosphere
|
(a) Black |
(b) Blue |
(c) Orange |
(d) Red |