Question

why photons coming with a high velocity falling on our body doen't pain??

Answer 1

Photons although coming with high velocity does not pain as the photon has a mass roughly equal to \[1.1 \times 10^{-58}kg\]. It is a constituent unit of light energy. Thus we know - \[Force = Mass \times Accleration\]

Thus we don't feel the pain as the product of the speed of light (\[3 \times 10^{8} m/s\] multiplied with the mass of the photon gives us that the force is very negligible.

Thus we do not feel any pain due to this negligible force..on our bodies..

Theoretically, the mass of a photon is considered as 0. Thus giving us Force =0 Newtons.

Thanks for the question..
@Arnab_Chatterjee

Answer 2

that depends on the frequency of the electromagnetic radiation, or the energy of the photon.
the sun light that comes to us is in the range that we can bare.
if you increase the frequency the energy increases, you must be aware that UV rays are harmful. thats because of high energy.............
so when photons fall on our body they transfer their energy in us, thats why we feel warm standing in sun.
if the rays that reaches us would be of high energy our body would have burned.

Answer 3

@binary3i , that's the question of intensity and rate of flow. There is definitely a kinetic flow which makes us warm but here the thing is about the striking force.

Answer 4

if you increase the frequency momentum increases.
and \[\delta P /\delta t = FORCE\]
where P is the momentum.
so more is the momentum more is the force.

Answer 5

if you increase the frequency momentum increases.
this was for photons.

Answer 6

Yes.. it depends on frequency too.. but momentum again bring in the mass and velocity.

Answer 7

velocity remains fixed,
actually it is a wave, but can also be taken as particle and so called photon.
high energy can be referred as more mass.

Answer 8

Correct... actually it can be defined in both perspectives..

Answer 9

exactly my friend

Answer 10

It's not only the frequency, but also the intensity and the flux. If only one high-energy photon hits you, it will destroy one cell at most, but if you put your hand under a laser (or strong sunlight) if you prefer, it will burn. .

Answer 11

@denijane , thanks for the additional info. :)

Answer 12

:) You're welcome.

Answer 13

yes actually ...................denijane