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Physics > May > Flashcards

May Flashcards

1
Q

What is a wave

A

A disturbance that transfers energy through matter or space

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2
Q

What does a wave consist of

A

Vibrations

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3
Q

What is a mechanical wave and write an example

A

Travel through physical matter which is deformed

Sound

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4
Q

What is an electromagnetic wave and write an example

A

Periodic oscillations of electrical and magnetic force field
Light

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5
Q

How can you classify a wave depending on how it moves

A

Transverse
Longitudinal
Surface

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6
Q

How does a longitudinal wave move

A

Moves parallel to the propagation of energy

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7
Q

What a are the parts of longitudinal waves

A

Compression: where it is more compressed
Rarefaction: where it spreads
Wave length: the distance from compression to compression

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8
Q

What is a transverse wave

A

A wave that moves perpendicular to the propagation of energy

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9
Q

What are the parts of a transverse wave and explain it parts

A 
Crest: highest point 
Trough: lowest point 
Rest: the equilibrium 
Amplitude: distance from rest to crest 
Wavelength: distance from crest to crest
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10
Q

How does a surface wave move

A

In circular motion

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11
Q

What type of oscillation is a sound wave

A

Mechanical

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12
Q

What is frequency

A

The number of oscillations per second

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13
Q

What is pitch

A

Our reception of frequency

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14
Q

What is the speed of sound at room temperature and through air

A

343 m/s

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15
Q

What things affect the speed of sound

A

Temperature
Medium
Pressure

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16
Q

What is loudness

A

The intensity of sound pressure

17
Q

What is a decibels

A

Units for sound level

18
Q

What is the Doppler effect

A

When the pitch changes when the sound source is moving

19
Q

How many decibels does a whisper produce

A

30

20
Q

How many decibels can you find in a concert

A

110

21
Q

What sound produces around 60 deciblesn

A

A normal conversation

22
Q

How does light travel

A

In straight line

23
Q

When does light change direction

A

When it hits another object

24
Q

What can happen to light when it hits an obstacle

A

Absorb
Reflected
Transfer

25
Q

What are the three types of objects

A

Opaque
Translucent
Transparent

26
Q

Opaque

A

Absorb all the light

27
Q

Translucent

A

Transmit and reflect light

28
Q

Transparent

A

Transmit all the light

29
Q

What is a luminous source

A

An object that give their own light

30
Q

The rate at which luminous source produces light

A

Luminous flux

31
Q

What are the units of light energy

A

Lumens

32
Q

What is illuminance

A

The amount of illumination given by the source

33
Q

What wavelength can a human eye see

A

400-700 nanometers

34
Q

What color is 400 nanometers

A

Blue

35
Q

What do you get after 700 nanometers

A

Infrared

36
Q

What wavelength does ultraviolet wave have

A

Less than 400 nanometers

Physics (5 decks)

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