Cosmic Shifts and Universal Expansion

What does redshift in the electromagnetic spectrum indicate about the motion of a celestial object?

• The object is moving towards the observer.

• The object is stationary relative to the observer.

• The object is moving away from the observer.

• The object's motion has no effect on the electromagnetic spectrum.

How does the Doppler effect explain redshift?

• It describes how sound waves change frequency as a source moves.

• It describes how light waves increase in frequency as a source moves away.

• It describes how light waves decrease in frequency as a source moves away.

• It describes how light waves remain constant in frequency regardless of the source's motion.

What is blueshift in astronomy?

• A shift to higher frequencies indicating an object is moving away.

• A shift to lower frequencies indicating an object is moving away.

• A shift to higher frequencies indicating an object is moving towards us.

• A shift to lower frequencies indicating an object is moving towards us.

What does Hubble's Law state about galaxies and redshift?

• The farther away a galaxy is, the less it is redshifted.

• The closer a galaxy is, the more it is redshifted.

• The farther away a galaxy is, the more it is redshifted.

• Hubble's Law does not relate distance to redshift.

What is cosmological redshift a result of?

• The intrinsic motion of stars within a galaxy.

• The expansion of the universe stretching the wavelength of light.

• The gravitational pull of black holes on light.

• The Doppler effect of individual stars.

How does redshift provide evidence for the expansion of the universe?

• It shows that all galaxies are moving towards each other.

• It indicates that the universe is contracting.

• It demonstrates that galaxies are moving away from each other.

• It proves that the universe is static and unchanging.

Which type of electromagnetic radiation would be most affected by redshift if a galaxy is moving away from us at high speed?

• Gamma rays

• Visible light

• Radio waves

• All are equally affected.

What would you observe if you were moving towards a source of light at a high speed?

• An increase in the redshift of the light.

• A decrease in the redshift of the light.

• A blueshift in the light.

• No change in the light's properties.

If a galaxy is moving away from us at a velocity that is proportional to its distance, which law is being demonstrated?

• Kepler's laws of planetary motion.

• Newton's law of universal gravitation.

• Hubble's law.

• The law of conservation of momentum.

What does a higher redshift in the light from a galaxy suggest about its velocity relative to us?

• The galaxy is moving towards us at a higher velocity.

• The galaxy is moving away from us at a lower velocity.

• The galaxy is moving away from us at a higher velocity.

• The galaxy's velocity relative to us cannot be determined from redshift.