Q1. How does the Doppler Effect enable the study of the expansion of the universe?
- (a) By measuring light interference in nearby stars.
- (b) By detecting a redshift in light from distant galaxies, indicating they are moving away.
- (c) By calculating the mass of the sun through reflected radio waves.
- (d) By measuring heat changes in pulsars using microwave radiation.
Answer & solution
Answer: (b) By detecting a redshift in light from distant galaxies, indicating they are moving away.
(1) Light interference measures wave superposition, not cosmic expansion.
(3) The Sun's mass is calculated via gravitational methods, not radio waves.
(4) Heat changes in pulsars are unrelated to mapping universal expansion.