# Waves Flashcards

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1
Q

What is a transverse wave?

A
• Oscillations perpendicular to direction of travel
• Don’t require a medium (usually!)
• All EM waves are transverse
2
Q

What is a longitudinal wave?

A
• Oscillations parallel to direction of travel
• Compressions and rarefactions happen
• Require a medium
3
Q

What type of wave are mechanical waves?

A

They can be transverse or longitudinal. However, they require a medium.

4
Q

The bigger the amplitude of the waves…

A

… The more energy they carry

5
Q

What is frequency?

A

The number of waves passing a point per second.

6
Q

What is the unit for frequency?

A

Hertz (Hz)

7
Q

How many waves per second equal 1Hz?

A

1 wave per second = 1 Hz

8
Q

What is the equation for wave speed?

A

v = f x lambda

Speed = Frequency x Wavelength

9
Q

The angle of incidence…

A

…Is equal to the angle of reflection.

10
Q

What is refraction?

A

The change in direction of a wave when it hits a boundary.

11
Q

When does refraction not happen?

A

When the waves hit the boundary at 90*

12
Q

Which way do waves bend when entering a medium that slows them down?

A

Toward the normal.

13
Q

What happens to water waves when they enter shallower water?

A

They slow down (and bend towards the normal)

14
Q

What is diffraction?

A

The spreading of waves when they pass through a gap or move past an obstacle.

15
Q

When is diffraction most noticeable?

A

When the width of the gap is similar to the wavelength.

16
Q

Why can hills be a problem when receiving TV reception?

A

The waves cannot diffract enough to reach certain places in hilly areas.

17
Q

What is interference?

A

The reinforcing or cancelling out of any type of wave when two identical sets of waves overlap.

18
Q

What happens when a crest meets a trough?

A

They cancel each other out.

19
Q

What happens when a trough meets a trough or a crest meets a crest?

A

They reinforce each other.