Comets.
Small fragments of meteors, formed by ice and rock mixed consitute the comets.
3x10^8 m/s, or the ‘speed of light’ - this applies to the entire spectrum
Photon has no rest mass but when photon travels at the speed of light, it gains momentum.
The energy of the photon is E= pc, c = speed of the photon and p= its momentum.
∴ E = pc
but p = h/λ (This comes from De-broglie's theory)
∴ E = hc/λ
frequency = ν = c/λ
∴E = hν
So you work hard and you do well i’m getting good grades or doing something better.