Question

When monochromatic light travels from one medium to another its wavelength changes but frequency remains the same. Explain. [NCERT Example, Delhi 2011]

Answer 1

Answer:

Frequency is the characteristic of the source. That is why it remains the same. But wavelength is charactristic of the medium. So wavelength and veloctiy both change.

Answer 2

Answer:

Frequency is the characteristic of the source while wavelength is the characteristic of the medium. When monochromatic light travels from one medium to another, its speed changes, so its wavelength (λ=c/v) changes but frequency v remains unchanged.

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