Doppler Shift: Frequency and Motion

What is the Doppler effect?

• A method to measure temperature changes

• A change in wave frequency due to the motion of the source or observer

• A process of sound amplification

• A phenomenon where light bends around objects

Which type of wave is the Doppler effect most easily noticed with?

• Radio waves

• Light waves

• Sound waves

• Water waves

What happens to the pitch of a sound as a train approaches and then moves away?

• The pitch remains constant

• The pitch decreases as it approaches and increases as it moves away

• The pitch fluctuates randomly

• The pitch increases as it approaches and decreases as it moves away

How can the Doppler shift of light be used in astronomy?

• To infer the speed and direction of distant stars and galaxies

• To determine the chemical composition of stars

• To calculate the age of the universe

• To measure the temperature of stars

What information can be inferred from the Doppler shift of light from galaxies?

• Their size and mass

• Their speed and direction

• Their distance from Earth

• Their gravitational pull