C.5 Doppler effect SL Flashcards
Doppler Effect
A change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source
How does the Doppler Effect affect sound waves
It causes a higher pitch as the source approaches, and a lower pitch as it recedes.
What happens to the frequency of waves when the source moves towards the observer?
The frequency increases
What is an example of the Doppler Effect in everyday life?
The changing pitch of a passing siren.
Can the Doppler Effect be observed with light waves?
Yes, it affects both sound and electromagnetic waves, including light.
How does the Doppler Effect apply to light waves?
It causes a shift in the wavelength of light, observed as a change in color.
What is redshift in the context of the Doppler Effect?
A shift of light to longer wavelengths (towards red) as objects in space move away from us.
What does blueshift indicate in astronomy?
An object in space is moving towards us, causing light waves to shift to shorter wavelengths
How do astronomers use the Doppler Effect?
To determine the movement of stars and galaxies relative to Earth.
What is the significance of spectral line shifts observed in stars?
They provide information about the star’s motion, speed, and direction.
How do you calculate the observed frequency for a moving source?
What does v represent in the Doppler Effect equations?
The speed of waves in the medium.
In the Doppler Effect formula, what does the plus and minus sign indicate?
Plus for moving towards, minus for moving away.
