Which of the following travels with the speed of light?

Explain the dual behavior of electromagnetic radiation.

Arrange the following types of radiations in increasing order of frequency: $(a)$ radiation from microwave oven,$(b)$ amber light from traffic signal,$(c)$ radiation from $FM$ radio,$(d)$ cosmic rays from outer space,and $(e)$ $X$-rays.

Arrange the following types of radiation in increasing order of frequency:
$(a)$ radiation from microwave oven
$(b)$ amber light from traffic signal
$(c)$ radiation from $FM$ radio
$(d)$ cosmic rays from outer space
$(e)$ $X$-rays

Calculate the energy per mole of photons of electromagnetic radiation having a wavelength of $700 \ nm$. $\left[h = 6.626 \times 10^{-34} \ J \ s, c = 3 \times 10^8 \ m/s, N_A = 6.022 \times 10^{23} \ mol^{-1}\right]$

Photoelectric effect is the phenomenon in which