P12-Waves

Question 1

What is wavelength

Answer 1

The wavelength of a wave is the distance of one entire oscillation of that wave.

Question 2

What is amplitude

Answer 2

The amplitude of a wave is the maximum displacement from the equilibrium position (the x-axis).

Question 3

What is time period

Answer 3

The time period is the time it takes for one entire oscillation of a wave.

Question 4

Formula for frequency

Answer 4

1/time

Question 5

Unit for frequency

Answer 5

Hz

Question 6

Formula for wave speed

Answer 6

Frequency x wavelength

Question 7

Symbol for wavelength

Answer 7

𝜆

Question 8

Define wave speed

Answer 8

The speed at which energy is transferred through the medium. It is equal to the product of the wave’s wavelength and frequency.

Question 9

What are ultrasound waves

Answer 9

Waves that have a higher frequency rhan 20kHz

Question 10

What is ultrasound scanning

Answer 10

A technique that involves ultrasound waves being transmitted and then partially reflected at a boundary before being detected by a detector. The time between transmission and detection can be used to calculate distances, and build up an image.

Question 11

What are transverse waves

Answer 11

Waves with oscillations that are perpendicular to the direction of travel/energy transfer

Question 12

What are seismic waves

Answer 12

Waves produced by earthquake

Question 13

What are s-waves

Answer 13

Transverse,seismic waves fhat cannot travel through liquids

Question 14

What is reflection

Answer 14

Reflection is when a wave bounces off a boundary. The angle of incidence always equals the angle of reflection.

Question 15

What are P waves

Answer 15

Longitudinal, seismic waves that travel at different speeds through solids and liquids.

Question 16

What are longitudinal waves

Answer 16

Oscillations fhat are parallel to the direction of travel/energy transfer

Question 17

What are electromagnetic waves

Answer 17

Transverse waves that transfer energy from the source of the waves, to an absorber. They form a continuous spectrum of different frequencies and all travel at the same speed in a vacuum.

Question 18

What is frequency

Answer 18

Number of waves passing a given point in a second.It is the inverse of the waves period

Question 19

What is human hearing

Answer 19

Humans can hear sounds in the frequency range of 20Hz to 20kHz.

Question 20

What is infrared

Answer 20

Used for cooking,electrical heaters and infrared imaging

Question 21

What is ionising radiation

Answer 21

Radiation that can cause the mutation of genes and cause cancer. X-rays and gamma rays are both forms of ionising radiation.

Question 22

What is period

Answer 22

The time it takes for one complete wave to pass a given point. It is the inverse of frequency

Question 23

What is the angle of incidence

Answer 23

The angle between the incident eay and normal

Question 24

What is the angle of reflection

Answer 24

Angle between the reflected ray and normal

Question 25

What is the normal

Answer 25

Imaginary reference line that is constructed perpendicular to a boundary at the point that the wave intercepts it.

Question 26

What are radio waves

Answer 26

Used for television and radio signals.Produced by oscillations in electrical circuits

Question 27

What is specular reflection

Answer 27

Reflection from a smooth surface,in a single direction

Question 28

What is diffuse reflection

Answer 28

On materials where surface is bumpy making image unclear

Question 29

How to calculate magnification

Answer 29

Image height/object height

Question 30

Define magnification

Answer 30

The ratio of the image height over the object height for a lens. Since it is a ratio, it has no units.

Question 31

What are microwaves

Answer 31

Used for satellitle communications and for cooking food

Question 32

What is the focal length

Answer 32

The distance between the centre of a lens and its principal focus

Question 33

What is eco sounding

Answer 33

A technique that used high frequency sound waves to detect objects in deep water and to measure the depth of the watee

Question 34

What is the convex lems

Answer 34

A lens that brings parallel rays to focus at the pri cipal focus.The image formed can be either real or virtual.

Question 35

What are colour filters

Answer 35

Filters that absorb certain wavelengths (colours) and transmit others. A blue filter for example will absorb all wavelengths other than those in the blue region of the colour spectrum.

Question 36

What is colour

Answer 36

Determined by frequency and wavelength

Question 37

What is constant temperature

Answer 37

A body remains at a constant temperature if it is absorbing radiation athe same rate that it is emitting it.

Question 38

What is the radiation dose

Answer 38

A meaure of the risk of harm to the body as a result of radiation exposure.

Question 39

What is ultraviolet

Answer 39

Used in energy efficient lamps and for sun tanning

Question 40

What is visible light

Answer 40

Onlt type of electromagnetic radiation that our eyes can detect.Used for finre optic communications

Question 41

Why will an object appear whire

Answer 41

If it emits all wavelengths equally

Question 42

What is a perfect black body

Answer 42

An object that absorbs all radiation incident on it and does not reflect or transmit any type of radiation

Question 43

Unit for wave speed

Answer 43

M/s

Question 44

How does angle of incidence relate to angle of reflection

Answer 44

Angle of incidence=angle of reflection

Question 45

What are P waves

Answer 45

Primary waves

Question 46

What are S waves

Answer 46

Secondary waves

Question 47

When does diffraction happen

Answer 47

When a wave passes through a gap and the wave will curve around as it comes out the gap

Question 48

Good absorbers will be

Answer 48

Dark,matt

Question 49

Good emitters will be

Answer 49

Dark,matt

Question 50

Good reflectors will be

Answer 50

Shiny

Question 51

Wavelength of red light

Answer 51

7 x 10-^7

Question 52

Wave length of violet light

Answer 52

4 x10^-7

Question 53

Frequency of red light

Answer 53

4x10^14

Question 54

Frequency of violet light

Answer 54

7x10^14