Stars moving towards earth shows:
Correct answer: A. Blue shift
- A. Blue shift
- B. Red shift
- C. No shift
- D. Green shift
Explanation
When star is moving towards earth, according to Doppler's shift wavelength decreases, as blue light has smaller wavelength so blue shift appears.
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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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