Doppler Effect/Red Shift/Blue Shift

Front

What is the Doppler Effect?

Back

The Doppler Effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

Front

What happens to light waves when a light source moves away from an observer?

Back

The light waves are stretched, leading to a longer wavelength, which is observed as a red shift.

Front

What is red shift?

Back

Red shift is the phenomenon where light from an object moving away from an observer is shifted towards the red end of the spectrum, indicating that the object is receding.

Front

What is blue shift?

Back

Blue shift is the phenomenon where light from an object moving towards an observer is shifted towards the blue end of the spectrum, indicating that the object is approaching.

Front

How does the Doppler Effect apply to sound waves?

Back

Similar to light, when a sound source moves away from an observer, the sound waves are stretched, resulting in a lower frequency (pitch), while moving towards the observer results in a higher frequency (pitch).

Front

What type of galaxy is the Milky Way?

Back

The Milky Way is a spiral galaxy.

Front

What is the significance of red shift in astronomy?

Back

Red shift is used to determine how fast an object is moving away from us and is a key evidence for the expansion of the universe.

Front

What is the relationship between red shift and distance in the universe?

Back

Generally, the greater the red shift, the farther away the galaxy is, indicating that the universe is expanding.

Front

What is the primary evidence for the Big Bang theory?

Back

The observed red shift of distant galaxies supports the Big Bang theory, suggesting that the universe is expanding from an initial singularity.

Front

What is the formula for calculating red shift (z)?

Back

Red shift (z) is calculated using the formula z = (λ_observed - λ_emitted) / λ_emitted, where λ is the wavelength.