The frequency of a plane electromagnetic wave travelling in free space is doubled

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

The frequency of a plane electromagnetic wave travelling in free space is doubled. What happens to its wavelength? (a) It remains unchanged. (b) It becomes one–fourth of the original value. (c) It becomes half of the original value. (d) It doubles.

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