alleryStart learning →Light waves with longer wavelengths always have which property?
AA higher frequency
BA greater speed
CA lower frequency
DA smaller speed
Answer & Solution
Correct answer: C. A lower frequency
1. Every electromagnetic wave travels at the same speed through empty space.
2. At a fixed speed, longer waves take longer to pass a point.
3. Fewer of them arrive each second, so the frequency is lower.
4. Speed cannot be the answer here, since motion never changes the speed of light.
_Source: OpenStax Astronomy (CC BY 4.0), Ch 4 "Earth, Moon, and Sky" and Ch 5 "Radiation and Spectra", section 5.1 The Behavior of Light_
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