By a monochromatic wave, we mean
[AFMC 1995]
A single ray
A single ray of a single colour
Wave having a single wavelength
Many rays of a single colour
To be precise, Monochromatic wave means of single wavelength not the single colour, as colour is subjective!
By Huygen's wave theory of light, we cannot explain the phenomenon of
[CPMT 1989; AFMC 1993, 99; MP PET 1995, 2003;RPMT 2003; BCECE 2003; Pb PMT 2004]
Two waves of same frequency and intensity superimpose with each other in opposite phases, then after superposition the
Which of the following conducts electricity