Which of the following explains that galaxies are receding from us?
Correct answer: B. Red shift
- A. Black holes
- B. Red shift
- C. Blue shifted
- D. All
Explanation
The phenomenon of redshift occurs when the light from distant galaxies is shifted towards the longer wavelength end of the spectrum, indicating that galaxies are moving away from us. This is a key piece of evidence supporting the theory of the expanding universe.
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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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