Which of the following rays has the maximum frequency?

The electromagnetic oscillator used in a microwave oven produces electromagnetic waves with a wavelength in the range of ......

If $\lambda_r$,$\lambda_v$,and $\lambda_x$ are the wavelengths of red light,violet light,and $X$-rays respectively,then which of the following relations is correct?

What protects us from $UV$ light emitted by the Sun?

Which is the correct ascending order of wavelengths?

If wavelengths of visible rays, microwaves, and $X$-rays are $\lambda_v$, $\lambda_m$, and $\lambda_x$ respectively, then which of the following relations is correct?