Physics Waves UHS 2022
PMDC Verified Question 58 of 125
If the wavelength of light coming from a galaxy shifts towards the red end of spectrum, then galaxy is:
A
Approaching Earth
B
Receding the Earth
C
Stationary
D
Approaching Earth or is stationary
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Receding the Earth
Concept:

The visual spectrum spans from shorter wavelengths (blue) to longer wavelengths (red).

Solution:

  • A Doppler "redshift" specifically means the observed wavelengths have elongated compared to their laboratory baseline.


  • Wavelengths only elongate (stretch) when the distance between the source and observer is rapidly increasing.


  • Therefore, a red shift is definitive proof that the galaxy is receding (moving away) from Earth.


Why other options are incorrect:

Approaching galaxies compress light waves, shifting them towards the shorter, blue end of the spectrum (Blueshift). Stationary galaxies exhibit zero shift.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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