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An Expanding

Redshift, and the EMS Review

• The shorter the , the higher the • The longer the wavelength, the lower the frequency • of are longer than wavelengths of light • composition can be determined by the spectrum of the present Doppler • 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

Which

or

Andromeda Galaxy 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 or

are

moving

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