Waves Flashcards

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1
Q

degree (°)

A

Used for temperature

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2
Q

hertz (Hz),

A

Used for frequency

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3
Q

metre (m),

A

Used for distance

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4
Q

metre/second (m/s)

A

Used for velocity

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5
Q

second (s)

A

Used for time

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6
Q

Longitudinal Wave

A

A wave in which the direction of movement is parallel to the direction of energy

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7
Q

Transverse Wave

A

A transverse wave is when the OSCILLATIONS travel PERPENDICULARLY (at right angles) to the direction of the wave

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8
Q

Amplitude =

A

the distance from the midpoint to the peak of a wave

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9
Q

What is wavelength

A

The distance between two corresponding points on the wave and is measured in metres

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10
Q

What is frequency

A

how many waves pass by a point every second and is measured in Hertz (Hz)

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11
Q

What is the Doppler Effect

A

The doppler effect is when the spurce moves towards the stationary observer, the wave fronts bunch up. This causes the wavelength to decrease and the frequency to increase. As the source moves past/away from the observer, the wavefronts spread out, the wavelength increases and the frequency decreases

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12
Q

What do all waves have in common

A

They can all be reflected and refracted

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13
Q

Electromagnetic radiations:

A
  1. radio waves
  2. micro waves
  3. infra-red radiation
  4. visible light
  5. ultraviolet
  6. x-rays
  7. gamma rays
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14
Q

Uses of electromagnetic radiations:

A
  1. radio waves - broadcasting and communications
  2. micro waves - cooking and satellite tranmissions
  3. infra-red radiation - heaters and night vision equipment
  4. visible light - optical fibres and photographgy
  5. ultraviolet - fluorescent lamps
  6. x-rays - observing internal structure of objects and materials
  7. gamma rays - medical equipment
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15
Q

Negative effects of excessive exposure to electromagentic waves:

A
  • microwaves; internal heating of body tissue
  • infrared; skin burns
  • ultraviolet; damage to surface cells and blindness
  • gamma rays; cancer, mutation
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16
Q

Light waves are transeverse or longitudinal?

A

Transverse

17
Q

Angle of incidence is equal to

A

the angle of reflection

18
Q

Describe the role of total internal reflection in transmitting information along optical fibres and in prisms

A

The light ray passes along the core at an angle greater than the critical angle. This then means the light ray is continuously reflected along the lengths of the optical fibre core.

19
Q

What is critical angle?

A

The angle of incidence for which the angle of refraction is 90 degree

20
Q

Sound waves are transeverse or longitudinal?

A

Longitudinal

21
Q

Frequency range for hearing in humans?

A

20Hz - 20 000Hz

22
Q

Understand how an oscilloscope and microphone can be used to display a sound wave

A

The microphone will transfer the sound into an electrical signal which the oscilloscope can display .The x axis show the time base, along the y axis voltage is displayed. These make the wave

23
Q

What does frequency relate to?

A

High frequency means high pitch.

24
Q

What does amplitude relate to?

A

The greater the amplitude the louder the sound.