Physics

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what are the large pieces of rock that the Eath's crust is cracked into?
tectonic plates
1 of 10
how old is our sun?
5000 million years
2 of 10
tectonic plates are ___ dense than the mantle.
less
3 of 10
other than brightness, how else can astronomers work out the distance to stars?
parallax
4 of 10
what kind of pollution makes it hard to see the stars at night?
light
5 of 10
what is the a harmful type of electromagnetic radiation given out by stars?
ultraviolet
6 of 10
what is the theory that the universe started with an explosion?
big bang
7 of 10
what is an example of a longituninal wave?
sound wave
8 of 10
what is an example of a transverse wave?
water wave
9 of 10
what is the unit of frequency of a wave?
hertz
10 of 10

Other cards in this set

Card 2

Front

how old is our sun?

Back

5000 million years

Card 3

Front

tectonic plates are ___ dense than the mantle.

Back

Preview of the front of card 3

Card 4

Front

other than brightness, how else can astronomers work out the distance to stars?

Back

Preview of the front of card 4

Card 5

Front

what kind of pollution makes it hard to see the stars at night?

Back

Preview of the front of card 5
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