Question

What physical quantity is the same for X- rays of wavelength 10^10 m,red light of wavelength 6800 A and radio waves of wavelength 500 m ?

Answer 1

For X- rays of wavelength 10^10 m,red light of wavelength 6800 A and radio waves of wavelength 500 m, physical quantity which is same is :

•For all rays in vaccum with different wavelengths, the speed of light is same.

• Speed of light in vaccum = 3×10^8 m/s

• Speed of light is independent of wavelength in vaccum.

• Therefore, all given rays with different wavelengths will have same speed in vaccum.