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Flashcards in Waves and Astronomy Deck (38):
1

What happens when the wave length increases?

The frequency decreases

2

Frequency

Number of complete waves per second

3

Units for frequency

Hertz (Hz)

4

Units for wave length

Metres (m)

5

Units for sound

Decibel (dB)

6

Amplitude

Maximum displacement

7

Centripetal force

A force that makes a body follow a curved path.

8

Speed of sound through air

343 m/s

9

Speed of sound through water

1493 m/s

10

Speed of sound through steel

5130 m/s

11

Gravity

The force that attracts a body towards the centre of the earth, or towards any other physical body having mass.

12

Astronomy

The study of space.

13

The Big Bang Theory

A theory in which the universe started at one point billions of years ago. It was a violent event.

14

Longitudinal Wave

A wave in which vibrations vibrate forward and backward in the same direction as energy..

15

Transverse Wave

A wave that vibrates at right angles.

16

Compression in a longitudinal wave

IIIIIIIIIIIIIIIIIIIII (As the wave pushes in)

17

Rarefaction in a longitudinal wave

I I I I I I I I I I I (Space between waves)

18

Examples of longitudinal waves

Sonar and Seismic waves (earthquakes)

19

Speed (m/s) equation

Distance travelled (m) / time taken (s)

20

Speed of light

3 x 10^8 m/s

21

Galaxy

A collection of billions off stars that orbit around a central point.

22

What do telescopes tell us about our universe?

It's ever expanding

23

Umbra

The inner region of a shadow cast by an opaque object. For example between the moon and Earth experiencing the total phase of an eclipse.

24

Shooting stars

Pieces of roc and dust travelling into the Earth's atmosphere with heat.

25

How have telescopes changed?

They can now see more as the objective lens is magnified therefore being able to take more light in.

26

Why are telescopes better on satellites rather than on Earth?

Light pollution
Clouds
Earths atmosphere
Pollution
High building/mountains.

27

Disadvantages of satellite telescopes

Expensive and hard to repair

28

Distance from Proxima Centauri to the sun

4.25 light years

29

Light year

The distance that light travels in one year.

30

Planet order acronym

My very easy method speed up names.
Mercury
Venus
Earth
Mars
Saturn
Uranus
Neptune

31

Asteroid Belt

A large region of asteroids that lies between the orbits of Mars and Jupiter.

32

Comets

An icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.

33

Distance from one side of the Milky way to the other?

100,000 ly

34

New Moon

The first lunar phase, when the Moon and Sun have the same ecliptic longitude.

35

Nebula

A cloud of dust, helium and hydrogen

36

Solar eclipse

When the moon passes in front of the sun, blocking it or a portion of it from view.

37

Lunar eclipse

When Earth passes between the sun and the moon, causing it to be partly or completely covered by Earth's shadow.

38

Nuclear Fusion

A reaction in which two or more atomic nuclei come close enough to form one or more different atomic nuclei.