Light of a single colour (single wavelength and frequency) is emitted from a spaceship that is stationary relative to the Earth. If the spaceship were to blast off, racing away from Earth at high speed, the light emitted from the spaceship would be observed on the Earth as now havinga.a higher frequency and longer wavelengthb.the same frequency and wavelengthc.a higher frequency and shorter wavelengthd.a lower frequency and shorter wavelengthe.a lower frequency and longer wavelength
Question
Light of a single colour (single wavelength and frequency) is emitted from a spaceship that is stationary relative to the Earth. If the spaceship were to blast off, racing away from Earth at high speed, the light emitted from the spaceship would be observed on the Earth as now havinga.a higher frequency and longer wavelengthb.the same frequency and wavelengthc.a higher frequency and shorter wavelengthd.a lower frequency and shorter wavelengthe.a lower frequency and longer wavelength
Solution
The correct answer is e. a lower frequency and longer wavelength. This is due to the Doppler effect, which states that an observer will perceive light from a source moving away from them as having a lower frequency (redshift) and therefore a longer wavelength.
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