Question

If Vg, Vx and Vm are the speeds of gamma rays, X-rays and microwaves respectively in vaccum, then

Answer 1

we know, increasing order of frequencies of spectrum is given by,

Radio wave < micro wave < infrared wave < visible rays < ultraviolet rays < x-rays < gamma rays < cosmic rays

and order of wavelengths of spectrum is given by,

Radio wave > micro wave > infrared wave > visible rays > ultraviolet rays > x-rays > gamma rays > cosmic rays

but speed of each radiation equals 3 × 10^8. because all radiations are component of electromagnetic wave. and speed of electromagnetic wave is 3 × 10^8 in vaccum.

so, $V_g=V_x=V_m$ = 3 × 10^8 m/s