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Physics 1 > Waves > Flashcards

Waves Flashcards

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1
Q

What is amplitude?

A

The displacement from the rest to the crest

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2
Q

What is wavelength?

A

The length of a full cycle (crest to crest)

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3
Q

What is frequency?

A

The number of complete waves produced per second

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4
Q

What does Hz mean?

A

Wave per second

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5
Q

If the angle of reflection is 50 degrees, what is the size of the angle of incidence?

A

50 degrees

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6
Q

Where is the normal?

A

A 90 degree angle from the surface of the mirror

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7
Q

What makes an image virtual?

A

When it appears to be somewhere (behind the mirror) but in reality, is not

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8
Q

What are transverse waves?

A

Vibrations perpendicular to the energy transfer of the wave (e.g. Light, EM waves, ripples)

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9
Q

What are longitudinal waves?

A

Vibrations parallel to the direction of energy transfer

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10
Q

How do you find frequency? (Hz)

A

Speed (m/s) / wavelength (m)

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11
Q

What is diffraction?

A

When waves spread out at the edges when they pass an obstacle

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12
Q

What causes a wave to greatly diffract?

A

A narrow gap or a long wavelength

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13
Q

What happens if the gap and the wavelength are the same size?

A

The wave fully diffracts

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14
Q

How does refraction work?

A

The wave passes through a medium denser than air and slows down, changing direction

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15
Q

What happens if the waves meet the medium along the normal?

A

They slow down but do not refract

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16
Q

What is the range of EM wave size?

A

10^-15 - 10^4

17
Q

____ frequency, ____ wavelength

A

Higher frequency, shorter wavelength

18
Q

Radio waves diffract. What does this make them useful for?

A

Sending waves around the world or obstacles by bouncing them off the Earth’s curved surface

19
Q

Mnemonics for remembering the electromagnetic spectrum

A

Rabbits Mate In Very Unusual eXpensive Gardens

Granny’s Xbox Uses Volts In My Room

20
Q

Why are microwaves good for satellite communication and mobile phones?

A

They can easily pass through the Earth’s atmosphere

21
Q

What is an echo?

A

A reflected sound wave

22
Q

How do you find wave speed?

A

Frequency * wavelength

(V = f*λ) [lambda]

23
Q

What is a mechanical wave?

A

One that must travel through a medium

24
Q

What is an electromagnetic wave?

A

One that doesn’t need to travel through a medium

25
Q

Uses of radio waves

A

Television

Radio

Mobile phones

Bluetooth

25
Q

Uses of micro waves

A

Cooking

Mobile phone calls

Satellite dishes

26
Q

Uses of infrared waves

A

Optical fibre communications

Toasters

Heaters

Grills

27
Q

Uses of light waves

A

Fibre optic cables

Digital cameras

28
Q

Which wave may be used to send a signal to a satellite through the ionosphere?

A

Microwave

29
Q

What will happen to the frequency, wavelength and speed of a reflected microwave?

A

Wavelength - decrease

Frequency - increase

Speed - same

Physics 1 (8 decks)

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