Assessment final

Question 1

What is a wave

Answer 1

rhythmic disturbance that carries energy but not matter

Question 2

What is a mechanical wave?

Answer 2

a type of wave that can travel only through matter

Question 3

Transverse wave?

Answer 3

a type of mechanical wave in which the wave energy causes matter in the medium to move up and down or back and forth at right angles to the direction the wave travels

Question 4

Medium?

Answer 4

a physical environment in which phenomena occur

Question 5

Longitudinal wave?

Answer 5

Medium moves directly parallel to the direction of the wave and its medium displacement is in the same direction of the wave movement.

Question 6

Electromagnetic wave?

Answer 6

waves that can travel through matter or empty spaces, or radio waves

Question 7

Amplitude

Answer 7

The maximum distance that the particles of a wave’s medium vibrate from their rest position. From crest to rest.

Question 8

Wavelength? (include measurement)

Answer 8

The distance from two consecutive points on a wave. units in m

Question 9

Frequency?

Answer 9

The amount of wavelengths to pass a particular point in one second. units in Hz

Question 10

Period?

Answer 10

The time it takes for one wavelength to pass a certain point. (units in seconds- s)

Question 11

Difference between transverse and longitudinal?

Answer 11

Transverse waves cause the medium to move perpendicular to the direction of the wave and longitudinal waves cause the medium to move parallel.

Question 12

What is a progressive wave?

Answer 12

A wave that continuously moves through medium in the same direction without a change in its amplitude

Question 13

What is a mechanical wave?

Answer 13

A wave that is an oscillation of matter and is responsible for the transfer of energy through a medium.

Question 14

what is Crest and trough?

Answer 14

Crest is highest point trough is lowest point

Question 15

First law of reflection?

Answer 15

When a ray reflects off a surface, the angle of incidence is equal to the angle of reflection.

Question 16

Examples of transverse wave?

Answer 16

A mexican wave, electromagnetic waves, vibrations on a guitar string

Question 17

Example of longitudinal wave?

Answer 17

Tsunami waves, slinky moving

Question 18

Example of progressive wave?

Answer 18

ocean waves, sound waves, water waves, light waves

Question 19

The difference between mechanical and electromagnetic waves?

Answer 19

Mechanical waves require a medium and electromagnetic waves do not require a medium to travel through.

Question 20

5 main properties of sound wave?

Answer 20

Amplitude, frequency, time period and velocity

Question 21

Relate the properties to pitch, volume and timbre?

Answer 21

The pitch of a soundwave depends on its frequency, the volume of the sound wave depends on the amplitude and the timbre of the sound depends on the pitch and the volume.

Question 22

Equations

Answer 22

v = fλ f=1/T

Question 23

How do sound waves work?

Answer 23

Sound is a mechanical wave which uses vibration and the particle surrounding the vibrations oscillate causing the kinetic energy from the oscillation to transmit through the medium as a longitudinal or compression wave.

Question 24

How does pitch work?

Answer 24

The shorter the wavelength the louder the pitch.

Question 25

Similarities between light and sound waves

Answer 25

Both refract, reflect and attenuate.

Question 26

Differences between light and sound waves

Answer 26

Light and fast travelling and sound are slower travelling, light is transverse and sound in longitudinal.

Question 27

Electromagnetic spectrum

Answer 27

Roman men invented very useful x-ray guns. Radio waves, microwaves, infrared, ultraviolet, x-rays, gamma rays

Question 28

Which electromagnetic sources are ionising?

Answer 28

X-rays and gamma rays

Question 29

what does ionising mean?

Answer 29

They have the unique capability to remove electrons from atoms and molecules in the matter through which they pass

Question 30

Short and long term dangers of these ionising elements

Answer 30

Skin damage, nausea, hair loss, cancer, damage to dna, blood clotting, death

Question 31

Give uses for each component of EMS in everyday life?

Answer 31

EM waves- communication, medical imagery, Gamma- radiotherapy, used as tracers in medicine, x-ray- medical imagery, detecting various tumors, infections or fractures, UV rays- dental procedures, killing of bacteria, Infrared- remote controls, thermal imagery, Microwaves- communications, radars for forecasts, heating application, Radio waves- television and radio, military and other communications.

Question 32

Identify that when a wave strikes a surface or change in medium, there will be reflection, transmission and absorption.

Answer 32

when a wave hits a change in medium, a refraction occurs and the wave will bounce off a barrier causing a reflection, the medium with absorb the wave and in doing so will lower the amlitude,