Which one of the following explains that all the galaxies are receding from us?
Correct answer: D. Red shift
- A. White shift
- B. Neutron stars
- C. Black holes
- D. Red shift
Explanation
Observed cosmological redshift of galaxy spectra shows systematic wavelength stretching indicative of recession and cosmic expansion, so redshift is the evidence.
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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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