waves pt3 Flashcards

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1
Q

what does the pitch of the sound affect

A

the frequency of the wavelength

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2
Q

why is does sound wave depicted in an oscilloscope screen look like a transverse wave

A

it makes it easier to read

compressions are drawn as peak and rarefactions are drawn as troughs

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3
Q

what are sound waves made by

A

vibrating objects eg vibrating instrument strings

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4
Q

what materials do sounds travel fastest through

A

solids and more dense materials because there are more particles so the wave can be passed on faster

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5
Q

what does the sound you hear depend upon

A

the shape of s sound wave

amplitude affects volume and frequency affects pitch

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6
Q

what does the loudness of the sound affect

A

the amplitude of a sound

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7
Q

what is the electromagnetic spectrum

A

a set of radiations that have different wavelengths and frequencies but all travel at the same speed in a vacuum

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8
Q

what is the electromagnetic spectrum from shortest wavelength to longest wavelength

A
gamma ray
x Ray
ultraviolet
infrared
microwave
radio
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9
Q

what does t mean if the wavelength is shorter

A

it has higher frequency and higher energy

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10
Q

example of things that use radio waves

A

Bluetooth
radio
Tv broadcasting

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11
Q

give an example of things that is microwaves

A

satellite tv

mobile phones

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12
Q

give an example of things that use visible light

A

photography

optical fibres for broadcasting etc

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13
Q

example of things that use infrared waves

A

remote control

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14
Q

how are Radio waves created

A

created by an ax current in an ariel

frequency of the wave is the same as the frequency of the ac current

these are detected by an ariel too. the radio wave energy is absorbed by the electrons in an ariel, creating an ax current with the same frequency as the radio waves

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15
Q

why do radio waves diffract around hills but to signals can’t

A

waves diffract round hills as wave length is similar to size

however th signals do not diffract round hull as wavelength is much less than hillsize

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16
Q

how are microwaves created

A

in an areal like radio waves

microwaves can pass through the inosphere so we can use them to send signals via satellites

17
Q

what are the dangers to these waves

A
radio- none
microwave- no long term damage yet      dicovered
IR- skin burns
visible light- damage retina
UV- skin cancer
X Ray's and Gamma- cancer
18
Q

what is the electromagnetic spectrum

A

a set of radiations that have different wavelengths and frequencies but all travel at the same speed in a vacuum

19
Q

what is the electromagnetic spectrum from shortest wavelength to longest wavelength

A
gamma ray
x Ray
ultraviolet
infrared
microwave
radio
20
Q

what does t mean if the wavelength is shorter

A

it has higher frequency and higher energy

21
Q

example of things that use radio waves

A

Bluetooth
radio
Tv broadcasting

22
Q

give an example of things that is microwaves

A

satellite tv

mobile phones

23
Q

give an example of things that use visible light

A

photography

optical fibres for broadcasting etc

24
Q

example of things that use infrared waves

A

remote control

25
Q

how are Radio waves created

A

created by an ax current in an ariel

frequency of the wave is the same as the frequency of the ac current

these are detected by an ariel too. the radio wave energy is absorbed by the electrons in an ariel, creating an ax current with the same frequency as the radio waves

26
Q

why do radio waves diffract around hills but to signals can’t

A

waves diffract round hills as wave length is similar to size

however th signals do not diffract round hull as wavelength is much less than hillsize

27
Q

how are microwaves created

A

in an areal like radio waves

microwaves can pass through the inosphere so we can use them to send signals via satellites

28
Q

what are the dangers to these waves

A
radio- none
microwave- no long term damage yet      dicovered
IR- skin burns
visible light- damage retina
UV- skin cancer
X Ray's and Gamma- cancer
29
Q

what are echos

A

echoes are due to sound waves reflected from a smooth hard surface

30
Q

what do vibrations created in an instrument produce

A

sound waves