Question

Which sources are called coherent sources?

विकल्प

• Sources that emit waves of the same frequency and maintain a constant phase difference

• Sources for which the phase difference changes randomly with time

• Independent light bulbs that form no stable visible fringes

• Sources whose intensities only add up on average

Answer 1

Coherent sources emit waves of the same frequency and maintain a constant phase difference. Both properties are part of the definition.