An Expanding Universe
Redshift, Blueshift and the Doppler Effect EMS Review
• The shorter the wavelength, the higher the frequency • The longer the wavelength, the lower the frequency • Red wavelengths of light are longer than blue wavelengths of light • Star composition can be determined by the spectrum of the gases present Doppler Waves • As an object moves away from you, the waves spread out. Wavelength gets longer and frequency decreases.
• As an object moves towards you, the waves bunch up. Wavelength gets shorter and frequency increases Doppler Waves • As an object moves away from you, the waves spread out. Wavelength gets longer and frequency decreases. • When dealing with light waves, we say that the object has red-shifted because the waves move towards the red end of the spectrum
Red shift, moving away. Doppler Waves • As an object moves towards you, the waves bunch up. Wavelength gets shorter and frequency increases • We say that the object has blue-shifted because the waves move towards the blue end of the spectrum.
Blue shift, moving towards. How can we tell that the universe is expanding?
https://www.youtube.com/watch?v=FhfnqboacV0H ow can we tell that the universe is expanding?
As an object moves away from you, the object’s spectrum of gases shifts to the red side of the spectrum Shifting Spectrums
Red shift/Blue shift Practice Blue Red • Nearby Star VENUS
Which
galaxy or
Andromeda Galaxy planet is
moving at
Bernard’s Galaxy the same
speed as the
Bear Galaxy nearby star?
Venus
SR - 5
Red shift/Blue shift Practice Blue Red What
Nearby Star galaxies or
planets are
moving Andromeda Galaxy
toward the
nearby Bernard’s Galaxy
star?
Bear Galaxy • Andromeda
Venus
SR - 5
Red shift/Blue shift Practice Blue Red
Nearby Star What
galaxies or
planets are
Andromeda Galaxy moving away
the nearby
Bernard’s Galaxy star?
Bernard’s,
Bear Galaxy Bear,
SR-5.
Venus
SR - 5
Red shift/Blue shift Practice Blue Red
Nearby Star
Is the
Andromeda
Andromeda Galaxy galaxy red or
blue shifted?
Bernard’s Galaxy
Blue Shifted
Bear Galaxy
Venus
SR - 5
Red shift/Blue shift Practice Blue Red
Nearby Star Which
galaxy or
planet is Andromeda Galaxy
moving
fastest away Bernard’s Galaxy from the
nearby star?
Bear Galaxy Benard’s it
is the
Venus most
red shifted
SR - 5
Red shift/Blue shift Practice Blue Red Which galaxy
Nearby Star or planet is
moving the
slowest away
Andromeda Galaxy from the
nearby star?
Bernard’s Galaxy
SR- 5
Bear Galaxy
Venus
SR - 5