A star moving away from earth shows _.
Correct answer: B. Red shift
- A. Green shift
- B. Red shift
- C. Blue shift
- D. None of these
Explanation
Redshift takes place when a star moves away from the earth. The red shift occurs due to Doppler's effect formed in light. The apparent frequency of light is decreased when the source is going away from the observer.
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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