What is loudness?

How loud or quiet a sound is

What is the factors affecting loudness?

The range of the vibration, and the distance of the object.

The higher the range of the vibration, the __________ the loudness

higher

The higher the distance of the object, the ____________ the loudness

lower

What is amplitude?

The maximum distance a particle can move, either forward or backward, in a sound wave.

The unit of amplitude

dB

Loudness = __________

amplitude

Pitch is?

How high or low a sound is on the musical scale.

Pitch= _______________

frequency

What is frequency?

Frequency is the number of complete vibrations

Shorter the object, the _________ the pitch

higher

faster the vibrations, the ____________ the pitch

higher

The unit of frequency

Hz

What is inteference of a sound wave?

The process of two waves combining.

Reinforcement is

The process of two sound waves with the same peak and trough meeting to get stronger

Cancellation is

The process of two sound waves with opposite troughs and peak meeting to cancel out each other.

When two waves reinforce, what happens to the amplitude or frequency?

Amplitude are added together and the frequency stays the same.

When two waves cancel, what happens to the amplitude or frequency?

Amplitudes are added up to get 0 but the frequency stays the same.

What is the collision theory?

The collisont heory states that the Moon was formed by a collison between Earth and a Mars-sized planet, Theia.

How was the moon formed?

1. Theia hit Earth,s ending dust and gas into the air.

2. Collision caused dust and gas to be broken off both planets.

3. The dust and gas were pulled together udner the force of gravity to form the Moon.

Give two evidence supporting the collision theory

Two of the following evidence:

1. The Moon is less dense than the Earth.

2. The Moon has a small iron core, just like the Earth.

3. The composition of the Earth's rocks and the Moon's rocks are the same.

4. The collision theory fits with the theory of how the Solar System was formed.

Give two evidence contradicting the collision theory

Two of the following evidence:

1. Venus has no Moon: It was expected that Venus would have a moon similiar to the way Earth got its moon.

2. The Moon's rocks was expected to be more similiar to Theia's rocks than the Earth's.

3. The surface of the Earth doesn't appear to have ever been molten.

What are nebulae? How are its particles? What are the gases it contains?

Clouds of dust and gas in space. The particles in a nebulae are very spread out. The gases ina nebulae consists of mainly hydrogen and a little helium.

How are nebulae formed?

A star explodes at the end of its life, sending dust and gas into a wide area of space, forming a nebula :)