Physics 2-waves Flashcards by ryan seed

What is the amplitude

Displacement from the rest position to the crest

How well did you know this?

Not at all

Perfectly

Wavelength is what

Full cycle of the wave from crest to crest

How well did you know this?

Not at all

Perfectly

Frequency is what

Measured in what

Number of complete waves passing a point per second

Hertz

How well did you know this?

Not at all

Perfectly

Most waves are

Transverse

How well did you know this?

Not at all

Perfectly

Transverse waves, the vibrations are what

Perpendicular to the direction of energy transfer of the wave

How well did you know this?

Not at all

Perfectly

Longitudinal waves examples

Sound/ultrasound

P-waves

How well did you know this?

Not at all

Perfectly

Transverse waves examples (4)

Light/Em

Waves on a string

S-waves

How well did you know this?

Not at all

Perfectly

In longitudinal waves, the vibrations are

Parallel to direction of energy transfer

How well did you know this?

Not at all

Perfectly

Frequency equation (period)

F=1/T

How well did you know this?

Not at all

Perfectly

Speed (wave) equation

F x lambda

How well did you know this?

Not at all

Perfectly

Speed of wave in independent of the … and …

Frequency and amplitude

How well did you know this?

Not at all

Perfectly

Speed / wavelength can vary depending on what

The medium it’s travelling through

How well did you know this?

Not at all

Perfectly

Angle of incidence

=angle of reflection

How well did you know this?

Not at all

Perfectly

Refraction changes what (2)

What doesnt it change (1)

Speed/wavelength

frequency

How well did you know this?

Not at all

Perfectly

Waves can change direction when?

Hits an optically dense object at an angle

How well did you know this?

Not at all

Perfectly

What never changes during refraction

The frequency

How well did you know this?

Not at all

Perfectly

A rectangular prism has what?

Hence what happens to white light entering

Parallel boundaries

Rays emerge parallel

What happens to white light when entering a triangular prism?

Why?

Forms a rainbow

As boundaries are not parallel

Sound waves are caused by what

Vibrating objects in the surrounding medium as a series of compressions

Sound travels fastest in what

Solid — liquid — gas

Sound waves hitting denser material will do what at an angle

Refract and speed up

Definition of frequency

Number of complete vibrations each second

High frequency means what for wavelength

Shorter wavelength

Loudness of sound depends on what

The amplitude of the wave

Human hearing frequency

20Hz < x > 20KHz Infrasound ——ultrasound

X rays don’t pass easily through what What does this show as

Denser material Bones/metal Negative image(white)

Y rays can be used for what

Treating cancer

The higher the frequency of the EM...

The more harmful/more ionising it is

Order of increasing frequency RMIVUXG

Radio Micro Infra Visible UV Xray Gamma (Real Monkeys Insists Very Useful X-mas Gifts)

Radio waves have what wavelength Gamma rays have what wavelength

1m 10^4 m 1m 10^-15 m

All EM waves are what type What speed do they travel at Higher frequency means what for wavelength

Transverse waves 3x10^8 m/s Shorter wavelength

Long radio waves can do what

Diffract (bend)

Short radio waves do what

Reflect off ionosphere

TV/FM have very short what? What does this not allow

Wavelengths No bending of the EM

What type of microwaves are used for communication

Ones which can pass through the watery atmosphere

In microwave ovens, what type of microwave is used

One where water molecules absorb microwave hence different wavelength to communication

Infrared is also known as What can it be used to monitor

Heat radiation Monitor temperature

Infrared can also be used as what (3)

Remote controls (different commands send different patterns of infrared) Cooking (toasters) Mobile phones/optical fibres

Infrared contributes to greenhouse effect how

EM from sun hits earth Bounces back as IR IR hits greenhouse gases Reflected back to earth warming it up

Removing an electron from an atom caused by EM is called what

Ionisation

What three types of EM can cause ionising radiation

UV/x-ray/Y