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p6 Flashcards

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1
Q

What are the two types of waves

A

-longitudinal
-transverse

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2
Q

What do all waves do

A

All waves transfer energy from one place to another

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3
Q

What are ocillations

A

The movement of waves up and down

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4
Q

What are the oscillations like in transverse waves

A

Occultations are perpendicular to the direction of energy transfer

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5
Q

What are the oscillations like in longitudinal waves

A

Oscillations are parallel to direction of energy transfer

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6
Q

What do all longitudinal waves require

A

A medium to travel in eg liquid or solid

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7
Q

What is amplitude

A

The maximum displacement of a point on a wave away from its undisturbed positions

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8
Q

What is a wavelength

A

The distance from a point on one wave to the equivalent point on the adjacent wave

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9
Q

What is frequency of waves

A

-number of waves passing a point per second
-hertz (Hz)
-1 Hertz=1 wave per second

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10
Q

What is the period of a wave

A

The time(in seconds) for one wave to past a point

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11
Q

What is the equation for period

A

1/frequency(Hz)

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12
Q

What is wave speed

A

The wave speed is the speed which the wave moved through the medium (the speed at which energy is transferred)

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13
Q

What is the equation for wave speed

A

Frequency(Hz) x Wavelength(m)

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14
Q

What method can we use to Measure speed of sound waves in air

A

Two people 50m apart,person a had symbols,person b has timer,person b darts the timer when they see symbols clashing,stops when they hear it,use distance travelled/time taken

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15
Q

What are the problems with method to measure wave speed

A

-every person has differnt reaction time
-reduce error by having a large number of observers with timer and find mean

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16
Q

What are electromagnet wanes

A

Transverse waves that transfer energy from the source to absorber

17
Q

What are the properties of waves on the left(red) side of the electromagnetic spectrum

A

-low frequency
-low wavelength

18
Q

What are the properties of waves on the right side of the electromagnetic spectrum

A

-high frequency
-short wavelength

19
Q

What does
Rich,Men,In,Vegas,Use,eXpensive,Gadgets
Show

A

Radio,microwaves,infrared,visible,ultraviolet,x-Rays,gamma

20
Q

Why can electromagnetic waves travel through a vacuum

A

They do not need a medium to travel through

21
Q

What speed do waves travel through in a wave

A

3x10(8) m/s
(300,000,000)

22
Q

What is refraction

A

Waves can change direction when they change speed moving one medium to another

23
Q

What happens if waves enter or leave the medium at right angles

A

They do not change direction

24
Q

What is a wavefront

A

An imaginary line that connects all the same points in a set of waves

25
Q

What happens when light waves move from air to glass

A

-first part of the wavefront slows when it moves into glass
-those parts of the wavelength get closer
-wavelength gets smaller and change direction to the normal

26
Q

What happens to wave direction when they sped up

A

Change direction way from the normal

27
Q

What happens when EM waves are absorbed or generated

A

Changes take place in atoms or nuclei of atoms

28
Q

What happens to the nucleus of gamma rays are emitted

A

The nucleus has less energy then it had at the start

29
Q

How can radio waves be produced

A

-radio waves can be produced when electrons oscillate in electrical currents

30
Q

What are the used of radio waves

A

-transmit radio
-terrestrial TV signals

31
Q

What are the uses of micro waves

A

-heat food
-communicate with satellites

32
Q

What are the use of infrared waves

A

-Heat food
-infrared cameras

33
Q

What are the uses of visible light

A

-communication in fibre optics

34
Q

Uses of ultra violet

A

-energy efficient lightbulb
-sun tanning

35
Q

Uses of x-rays and gamma rays

A

-medical treatment
-medical imaging
-detect cancers

36
Q

Describe how the radio waves reaching the car aerial produce signals in the electrical circuit of the car radio.

A

-(the car aerial) absorbs radio waves or energy
-electrons are made to vibrate (in the aerial)
-creating an alternating current (in the aerial circuit)
-the (signal) frequency is the same (as the radio wave)

37
Q

Explain why the light refracts as it passes from air into glass

A

-speed / velocity in the glass is lower
-so the edge of the wave(front)entering the glass slows down
-but the part of the wave(front) in
the air continues at the higher
speed / velocity

physics (9 decks)

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