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Flashcards in Physics Deck (23)
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1

What is a wave?

Oscillations that transfer energy without the transfer of matter

2

Define oscillation

Movement about a central point

3

Label arrow 1

Wavelength

4

Label arrow 2

Amplitude

5

Define wavelength

Distance between two consecutive points on a wave OR the length of a complete oscillation

6

Define displacement

Distance of a point on a wave from the equilibrium position

7

Define amplitude

Maximum displacement from the wave to the equilibrium point (central line)

8

Define time period and give its unit

The time for one complete oscilliation (wave)

Unit: second

9

Define frequency and give its unit

Number of complete waves per second 

Unit is hertz (Hz)

10

What is the formula that relates time period and frequency

T = 1 / f

11

What do the symbols mean in the following equation:

 

v = wave speed

lambda = wavelength

f = frequency

12

Describe how the displacement of a point on a wave will change with time

It will go up and down as if it is oscillating about a point

13

Name the two types of wavefront

Longitudinal and transverse

14

Describe what a transverse wave is and give an example

The wave oscillates perpendicular to the direction of energy transfer. E.g. light waves (Electromagnetic spectrum)

15

Describe what a longitudinal wave is and give an example

The wave oscillates parallel to the direction of energy transfer e.g. sound

16

Describe how sound waves are transferred

They are transferred via particle vibrations

17

Compare sound and light

Sound has a lower wave speed (330m/s) compared to light (3x108m/s)

Sound needs particles to travel and cannot travel through a vacuum

Both are waves

Sound tends to be lower frequency and longer wavelengths

Sound is longitudinal and light is transverse

18

Name the 7 parts of the EM spectrum

Radio Micro IR Visible UV X-Ray Gamma

19

Convert nm into m

1nm = 1x10-9m

20

Convert MHz into Hz

1MHz = 1x106Hz

21

State what the inverse square law is

As the distance from the light source increases the intensity of light will decrease by square

22

What is refraction?

The apparent changing of direction of light when it hits a boundary between two media (e.g. glass and iar)

23

State the meanings of the terms in the equation

n = the refractive index of the material

c = the speed of light in air (vacuum)

v = the speed of light in the material