Waves

Question 1

What do waves do?

Answer 1

Waves transfer energy and are repeated vibrations.

Question 2

What are Oscillations?

Answer 2

Vibrations.

Question 3

which way do Transverse waves move?

Answer 3

Perpendicular ( at right angles) to the direction of energy transfer.

Question 4

Examples of Transverse waves?

Answer 4

Water waves, light waves
(microwaves, gamma-waves).

Question 5

What speed to transverse waves move at?

Answer 5

3x10^8 m/s

Question 6

Which way do vibrations in longitudinal move?

Answer 6

Parallel (Back and forth) to the direction of energy transfer.

Question 7

Examples of longitudinal waves?

Answer 7

Sound waves, Ultrasound.

Question 8

What do transverse waves have?

Answer 8

Peaks, troughs, amplitude.

Question 9

What do longitudinal waves have?

Answer 9

Compression (compressed), Rarefaction (spread out).

Question 10

Wave speed equation?

Answer 10

Wave speed=frequency X wavelength

Wave speed- m/s
Frequency- Hz
Wavelength- m

Question 11

What is wavelength?

Answer 11

Distance between two identical parts of the wave.

Question 12

What is amplitude?

Answer 12

Maximum displacement of the wave.
(Bigger amplitude= more energy)

Question 13

What is frequency?

Answer 13

Number of waves passing a point per second (measured in hertz (Hz) )

Question 14

What is the Time period?

Answer 14

Time (in seconds) for the wave to complete one vibration (oscillations)

Question 15

Wave period equation?

Answer 15

Wave period (s) = 1/ frequency

T= 1/f

Question 16

Law of reflection for plain mirror?

Answer 16

Incidence always equals the angle of reflection ( i•=r• )

Question 17

How to calculate uncertaincy?

Answer 17

Find range then half it.

Question 18

When does a waves speed change and what happens to it?
(Rarefaction)

Answer 18

-when it crosses a boundary
-changes direction

Question 19

What happens to wave speed with a more dense medium?

Answer 19

Decreases.

Question 20

What happens to wavelength with a more dense medium?

Answer 20

Decreases.

Question 21

What happens to frequency with a more dense medium?

Answer 21

Stays the same.

Question 22

What happens to wave speed with a less dense medium?

Answer 22

Increases.

Question 23

What happens to wavelength with a less dense medium?

Answer 23

Increases.

Question 24

What happens to frequency with a less dense medium?

Answer 24

Stays the same.

Question 25

What is the specific heat capacity of a substance?

Answer 25

Energy needed to raise the temperature of 1kg of the substance by 1•C

Question 26

Energy transferred equation?

Answer 26

Energy transferred = mass X specific heat capacity X temperature change

Question 27

What are the electromagnetic wave properties?

Answer 27

-All transverse waves -All transfer energy -They can all be absorbed by objects -Travel at speed of light (300,000,000 m/s) in a vacuum

Question 28

What is ionising radiation?

Answer 28

Mutate cells (Knocks of cells)

Question 29

All Types of EM waves?

Answer 29

-Radiowaves -Microwaves -Infared (IR) -Visible light -Ultraviolet (UV) -X-rays -gamma rays

Question 30

What happens to medium wavelength radiowaves?

Answer 30

Reflected back to the earths surface by a layer in the atmosphere called the ionosphere.

Question 31

What happens to microwaves wavelength?

Answer 31

(VHF radiowaves ) can pass through the ionosphere and out into space.

Question 32

Properties of High energy waves?

Answer 32

-Transfer much more energy than longer-wavelength EM waves. -Can travel straight into substances and can go through them (if not dense or too thick) -Can cause harm to the human body