Flashes are in constant motion
Answer:
C
Explanation:
Coz its like that (ye ik probs wrong ans but ye)
The missing question is: how many photons are produced per second?
Answer:

Explanation:
The energy of a photon is given by

where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
In this problem, the photons have wavelength
, so each photon has an energy of

The total energy emitted by the bulb in 1 second is
E = 100 J
Therefore, the number of photons emitted per second is

Explanation:
Total surface area of cylinder:

sheet of metal required = 120.95 cm^2