The relation between the velocity of light (c), frequency (v) and wavelength \((\lambda)\) is:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → \(c=v \lambda\)
For any wave, speed = frequency × wavelength. In one second, \(v\) waves pass a point and each is \(\lambda\) long, so the wave travels \(v\lambda\) in one second.
For light this gives \(c=v\lambda\), with \(c\approx3\times10^{8}\,\mathrm{m/s}\) in vacuum. The speed is fixed, so a higher frequency means a shorter wavelength: violet light has a shorter wavelength than red light.