Explanation:
When the intensity of a light source in increased, a large number of photons are emitted from the light source. Hence, option (a) is correct.
Due to increase in the number of photons, total energy of the photons emitted per unit time also increases. Hence, option (b) is also correct.
Increase in the intensity of light increases only the number of photons, not the energy of photons, Hence, option (c) is incorrect.
The speed of photons is not affected by the intensity of light, Hence, option (d) is incorrect.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
An atomic nucleus 
emits several a and b radiations and finally reduces to 
. It must have emitted
|
(a) 4a and 2b |
(b) 6a and 4b |
(c) 8a and 24b |
(d) 4a and 16b |
The minimum intensity of light to be detected by human eye is 
. The number of photons of wavelength 5.6 
entering the eye, with pupil area 
, per second for vision will be nearly
|
(a) 100 |
(b) 200 |
(c) 300 |
(d) 400 |
The sun emits a light with maximum wavelength 510 mm while another star X emits a light with maximum wavelength of 350 nm. What is the ratio of surface temperature of sun and the star X
|
(a) 2.1 |
(b) 0.68 |
(c) 0.46 |
(d) 1.45 |
If radius of the 
nucleus is estimated to be 3.6 Fermi then the radius of 
nucleus be nearly
| (a) 4 Fermi | (b) 5 Fermi | (c) 6 Fermi | (d) 8 Fermi |
In the circuit shown P ≠ R, the reading of the galvanometer is same with switch S open or closed. Then
|
(a) |
(b) |
(c) |
(d) |
