Physics Waves MDCAT 2016
PMDC Verified Question 111 of 125
The red shift measurement of Doppler effect of galaxies indicate that the universe is
A
Expanding
B
Stationary
C
Contracting
D
Oscillating
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Expanding
Concept:

Redshift in astronomical terms means the light from distant objects is stretched to longer (redder) wavelengths.

Solution:

  • According to the Doppler effect, light waves from a source moving away from an observer stretch out (Redshift).


  • Edwin Hubble observed that almost all distant galaxies exhibit a redshift, and the farther away they are, the greater the redshift.


  • This profound observation serves as the primary evidence that space itself is stretching, proving the Universe is uniformly expanding.


Why other options are incorrect:

If the universe were contracting, we would observe widespread blueshifts. A stationary universe would yield no net shifts.

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