Physics- waves and optics

?
  • 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.
1 of 30
Give four examples of waves?
water, sound, light and radio
2 of 30
What two types of waves are there?
Transverse and Longitudinal
3 of 30
Discribe Transvers waves?
water, light, the oscillation is right angles to the direction of travel (think of wigling a slinky from side to side)
4 of 30
Describe Longidudinal waves?
sound, the oscillation is parallel to the direction of travel (pushing a slinky)
5 of 30
If the waves are close together will the pitch be high or low
high
6 of 30
What is wavelength and what is it measured in?
The length between each wave ƛ and measured in m
7 of 30
How do you measure the speed of a wave if you are given the distance and the time?
v=d/t
8 of 30
What is frequency and what is it measured in?
Frequency f is the rate in which something occurs and is measured in Hz
9 of 30
How do you find the speed of a wave given the wavelength and the frequency?
v=fƛ
10 of 30
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)
11 of 30
What is amplitude?
Amplitude is the distance from the centre of the wave to the top or bottom
12 of 30
What is period?
Period T is a period of time taken to do something and is measured in s
13 of 30
How do you find out T (period) given the frequency?
T=1/f
14 of 30
If a wave is long will it have a lower or higher frequency?
lower
15 of 30
How do you find out wavelength given the distance and number of waves?
ƛ=d/N
16 of 30
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
17 of 30
Oscillating electric charges always produce what?
an electromagnetic wave with the same frequency
18 of 30
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
19 of 30
What is refraction?
• Refraction is the bending of light as it passes through one medium to another due to a change in speed
20 of 30
What changes in different mediums?
The speed of light changes in different mediums
21 of 30
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
22 of 30
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
23 of 30
What is the critical angle?
• The critical angle is the angle of refraction which reaches 90 degrees
24 of 30
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
25 of 30
What do optic fibres do?
Optic fibres use total internal reflection to transfer data by a ray of light bouncing around
26 of 30
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
27 of 30
What happens when you shine a ray of light on a convex lense?
Convex comes in- converging
28 of 30
What happens when you shine a ray of light onto a concave lense?
Concave goes out- diverging
29 of 30
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
30 of 30

Other cards in this set

Card 2

Front

Give four examples of waves?

Back

water, sound, light and radio

Card 3

Front

What two types of waves are there?

Back

Preview of the front of card 3

Card 4

Front

Discribe Transvers waves?

Back

Preview of the front of card 4

Card 5

Front

Describe Longidudinal waves?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »