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Hydrogen gas in the lab emits light with a frequency of 4.50 x 10 14 Hz. Hydrogen gas in stars from distant galaxies is observed to have a frequency of.

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Presentation on theme: "Hydrogen gas in the lab emits light with a frequency of 4.50 x 10 14 Hz. Hydrogen gas in stars from distant galaxies is observed to have a frequency of."— Presentation transcript:

1 Hydrogen gas in the lab emits light with a frequency of 4.50 x 10 14 Hz. Hydrogen gas in stars from distant galaxies is observed to have a frequency of 4.40 x 10 14 Hz. a)Is the galaxy moving towards or away from Earth? b)Calculate the speed of the galaxy Tūrei, 12 Haratua 2015 Do now: Hint: c = 3.0 x 10 8 ms -1

2 Think-Pair-Share What would the spectral shift of galaxies look like if the universe was collapsing? What would cause the universe to collapse?

3 Today’s Kaupapa: Today’s Tasks: LO5: Explain the red-shift of stars and how this supports an expanding universe 1)Finish Activity 6A 2)NCEA questions 3)Derive Doppler (E/S) Reminder: H/W Set 4 (Doppler) due Thursday 14 th Feb due Thursday 14 th Feb

4 Balloon Ants…

5

6 Videos Perimeter Institute (30 min) - The Mystery of Dark Matter TVNZ7 Ever Wondered: Episode 7

7 Tim observes an apparent change in frequency when a helicopter flies directly over his head. When the helicopter is travelling at 32 ms  1 the frequency of the sound wave directly in front of it is 828 Hz. The speed of sound in air is 3.40  10 2 ms  1. 1) Calculate the frequency of the sound wave produced by the helicopter to the correct number of significant figures. 2) The helicopter is not travelling directly towards Tim. Explain how the frequency of the sound wave Tim hears, as the helicopter gets closer, compares with the frequency of the sound wave directly in front of the helicopter (828 Hz). Do now: Tūrei, 12 Haratua 2015

8 Solution: Tūrei, 12 Haratua 2015 (M) (E)

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