The wave nature of light can be determined by $......$.

Four light sources produce the following four waves:
$(i)$ $y_1 = a \sin(\omega t + \phi_1)$
(ii) $y_2 = a \sin(2\omega t)$
(iii) $y_3 = d' \sin(\omega t + \phi_2)$
(iv) $y_4 = d' \sin(3\omega t + \phi)$
Superposition of which two waves gives rise to interference?

If the amplitude ratio of two sources producing interference is $3:5$,the ratio of intensities at maxima and minima is

The frequency of a light wave with a wavelength of $500 \, \mathring A$ is $....... \, Hz$.

If the wavelength of light is $4000 \, Å$, then the number of waves in a length of $1 \, mm$ will be:

Which of the following is conserved when light waves interfere?