Waves Ch6 Flashcards

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1
Q

what are the two types of waves

A
  • longitudinal: direction of the wave is the same as the amplitude
  • transversal: direction of the wave is different than the amplitude
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2
Q

draw a longitudinal wave diagram

A

should include:
- multiple state lines
- compression
- rarefactor
- wavelength
- amplitude

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3
Q

draw a transversal wave diagram

A

should include:
- waves
- peak
- trough
- wavelength
- amplitude

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4
Q

what is the amplitude

A

the distance form the peak or trough of a wave to it’s point of rest

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5
Q

what is the wavelength

A

the distance from one point on a wave to the same point in the next wave

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6
Q

what is frequency

A

waves per second

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7
Q

what is the unit to measure frequency

A

hertz : meters/ second

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8
Q

what is the equation for speed in a wave diagram

A

speed= frequency x wavelength

V=f x λ

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9
Q

what are the seven levels of frequency

A
  • radio
  • microwave
  • infrared
  • visible light
  • ultrasound
  • X-ray
  • gamma rays
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10
Q

what is reflection

A

waves reflected at the same angle that they strike in

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11
Q

what is refraction

A

waves change direction and speed when traveling a different medium

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12
Q

what is diffraction

A
  • waves bend around an object
  • when passing through a gap, the greatest diffraction occurs if it’s the size of the wavelength is the same or smaller
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13
Q

what are the properties of sound waves

A
  • to make sound they need a vibrating object
  • need a medium to travel
  • travel faster through denser material
  • can be reflected, refracted and diffracted
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14
Q

what is an echo

A

reflection of sound against a flat surface

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15
Q

what is the equation for the speed of normal sound and the speed of an echo

A

normal:
speed= distance travelled/ time taken

echo:
speed= distance x2/ time

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16
Q

what is human hearing

A

20-20,000 Hz

17
Q

uses for ultrasound

A
  • echolocation: bats, dolphins
  • scan for pregnancy
  • cleaning tools
  • sonar
  • industrial testing quality of material
18
Q

what is the speed of sound in the air, water and solid

A

air: 330m/s
water: 1500m/s
solid: 5000m/s