# Physics- waves and optics

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• Created by: JamieH98
• Created on: 05-04-13 12:21
What are waves?
• Waves are oscillations which carry energy from one place to another without any matter being transferred.
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Give four examples of waves?
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What two types of waves are there?
Transverse and Longitudinal
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Discribe Transvers waves?
water, light, the oscillation is right angles to the direction of travel (think of wigling a slinky from side to side)
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Describe Longidudinal waves?
sound, the oscillation is parallel to the direction of travel (pushing a slinky)
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If the waves are close together will the pitch be high or low
high
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What is wavelength and what is it measured in?
The length between each wave ƛ and measured in m
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How do you measure the speed of a wave if you are given the distance and the time?
v=d/t
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What is frequency and what is it measured in?
Frequency f is the rate in which something occurs and is measured in Hz
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How do you find the speed of a wave given the wavelength and the frequency?
v=fƛ
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What is the speed of light? What is the speed of sound? Which one is faster?
The speed of light (3×10⁸ m/s) is faster than the speed of sound (340 m/s)
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What is amplitude?
Amplitude is the distance from the centre of the wave to the top or bottom
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What is period?
Period T is a period of time taken to do something and is measured in s
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How do you find out T (period) given the frequency?
T=1/f
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If a wave is long will it have a lower or higher frequency?
lower
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How do you find out wavelength given the distance and number of waves?
ƛ=d/N
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What is the electromagnetic spectrum and what is the order of it?
The range of wavelengths from high to low and the range of frequency from low to high- Radio waves, Micro waves, Infa red, Visable light, UV, Xrays, Gamma rays
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Oscillating electric charges always produce what?
an electromagnetic wave with the same frequency
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What is the gel on an ultrasound scan used for?
• The gel on a ultra sound scan is used to reduce friction, reduce reflections and reduce distortion in image
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What is refraction?
• Refraction is the bending of light as it passes through one medium to another due to a change in speed
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What changes in different mediums?
The speed of light changes in different mediums
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What happens when a ray of light passes through a less dense to a more dense medium?
• When a ray of light passes from a less dense to a more dense medium it changes direction towards the normal
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What happens to a ray of light when it passes through a more dense to a less dense medium?
• When a ray of light goes from a more dense medium to a less dense medium the ray of light goes away from the normal
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What is the critical angle?
• The critical angle is the angle of refraction which reaches 90 degrees
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What happens when a ray of light has a angle of incidence greater than the critical angle and what is this called?
• If the angle of incidence is greater than the critical angle no light energy can escape and it is all reflected. This is called TOTAL INTERNAL RELECTION
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What do optic fibres do?
Optic fibres use total internal reflection to transfer data by a ray of light bouncing around
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What do curved reflectors do?
• Curved reflectors make use of the law of reflection: they focus energy to the detector to concentrate it and it has a large area to gather energy
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What happens when you shine a ray of light on a convex lense?
Convex comes in- converging
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What happens when you shine a ray of light onto a concave lense?
Concave goes out- diverging
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What happens when you shine visable light on a prism?
• When you shine visable light through a prism you get a visable spectrum RedOrangeYellow Green BlueIndigoViolet
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## Other cards in this set

### Card 2

#### Front

Give four examples of waves?

### Card 3

#### Front

What two types of waves are there?

### Card 4

#### Front

Discribe Transvers waves?

### Card 5

#### Front

Describe Longidudinal waves?

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