WAVES

Question 1

What are waves

Answer 1

disturbance that transfer energy from one place to another without transferring matter and are made up of periodic motion

Question 2

What are sources of waves

Answer 2

disturbances such as vibrations or oscillations

Question 3

what is a periodic motion

Answer 3

a motion that is repeated at regular intervals

Question 4

What are transverse waves and state an example

Answer 4

• transverse waves are waves that travel perpendicular to the wave motion
• EM WAVES

Question 5

What are longitudinal waves and state an example

Answer 5

• longitudinal waves are waves that travel parallel to the wave motion
• SOUND WAVES

Question 6

What are crests and troughs

Answer 6

• formed in a transverse wave
• Crests are regions of maximum displacement
• troughs are regions of minimum displacement

Question 7

What are compressions and rarefactions

Answer 7

• formed in a longitudinal wave
• Compressions are regions of high pressure are particles are closest together
• Rarefactions are regions of low pressure as particles are furthest apart

Question 8

What is a wavefront

Answer 8

Imaginary line joining all adjacent points on a wave that are in the same phase

Question 9

How to determine wavelength from a wavefront

Answer 9

• distance between two consecutive wavefronts are equivalent to one wavelength

Question 10

What can we determine from a displacement-distance graphs

Answer 10

• amplitude
• wavelength

Question 11

What can we determine from a displacement-time graph

Answer 11

• amplitude
• period
  -frequency

Question 12

State each wave term and explain what they are

Answer 12

amplitude:max magnitude of displacement from the rest position (METRE)
wavelength:Distance between two successive troughs or crests or the shortest distance between two (M)
Period: Time taken to produce one complete wave(SECOND)
Frequency: Number of complete waves produced in one sec (Hz)

Question 13

wavemotion in a ripple tank

Answer 13

Source generates water waves that move outwards. Kinetic energy is transferred from the source outwards through the water particles which are the medium. as the water waves pass through the water particles, wave particles gain ke and move up and down.

Question 14

what is a sound wave

Answer 14

longitudinal
form of energy transferred from one pt to another through a medium created by a vibrating source

Question 15

pitch and loudness

Answer 15

Pitch: Higher the frequency, higher the pitch
Loudness: Higher the amplitude, higher the loudness

Question 16

What is an echo

Answer 16

repitition of sound due to the reflection of sound off a surface
2d divided by d

Question 17

ultrasound

Answer 17

soundwaves with frequencies above 20000 Hz
can be used in quality control to check for cracks in objects or in medical imaging to obtain images from inside the body. This can be done by measuring the time interval between sending the signal and receiving the reflected signal.

Question 18

What type of waves are EM waves

Answer 18

transverse

Question 19

what is the speed of waves in a vacuum

Answer 19

3 x 10^8 m/s

Question 20

Arrange the em spectrum in order of increasing wavelength

Answer 20

gamma rays, x rays ,ultraviolet,visible light, infrared ,microwave, radio waves

Question 21

arrange em spectrum in order of increasing frequency

Answer 21

radio waves,microwaves,infrared,visible light. ultraviolet light, xray ,gamma rays

Question 22

uses of radio waves

Answer 22

radio broadcasting , used in astronomy to study outerspaced

Question 23

used of microwaves

Answer 23

heating of food, global positioning system(GPS)

Question 24

uses of infrared

Answer 24

remote controls, infrared cooker and infrared thermometers

Question 25

uses of visible light

Answer 25

photography

Question 26

uses of uv rays

Answer 26

sunbeds for artificial tanning sterilisation of medical and lab equipment

Question 27

uses of x rays

Answer 27

imaging of bones in radiation therapy luggage screening in airports to increase safety