Question

Which X-rays having more wavelength, soft X-ray or hard X-ray?

Answer 1

Electromagnetic spectrum in an increasing order of wavelength is given as :
Gamma rays < Hard X-rays < Soft X-rays < UV < Visible < Infrared < micro waves < radio waves.
X-rays have small wavelength as compared to micro waves and radio waves. Among soft and hard X-rays, soft X-rays have more wavelength and low energy.