Question: When an electromagnetic wave travels from one medium to another with a different speed of propagation, the frequency of the wave remains the same. Its

When an electromagnetic wave travels from one medium to another with a different speed of propagation, the frequency of the wave remains the same. Its wavelength, however, changes.
(a) If the wave speed decreases, does the wavelength increase or decrease? Explain.
(b) Consider a case where the wave speed decreases from c to 3/4c. By what factor does the wavelength change?

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