Topic six - waves Flashcards Preview

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Flashcards in Topic six - waves Deck (17):
1

how do waves work

they transfer energy without transferring any matter

2

what is the amplitude

it is the height of the crest from the undisurbed position

3

what is the wavelength

it is the distance from one crest to the next

4

what are transverse waves

they are waves where the oscillations are perpendicular to the direction of energy transfer

5

what are longitudinal waves

they are waves where the oscillations are parallel to the direction of energy transfer

6

how is the wave speed worked out

the wavelength x the frequency

7

what is the difference between specular reflections and diffuse reflections

specular is where all the waves are reflected in the same direction. diffuse is where they are scattered

8

go along the EM spectrum from longest to shortest

radio, micro, infrared, visible, ultra violet, x-ray, gamma ray.

9

what happens to a light ray when it enters a denser medium

it bends towards the normal

10

what is distinctive about long wavelength radio waves

they can bend around the curvature of the earth

11

what is distinctive about short wavelength radio waves

they can be reflected off the ionosphere

12

what are the two main uses of microwaves

they are used in satellites and they are used in microwave ovens

13

what is a leslie cube

a hollow, watertight, metal cube made of e.g. aluminium, whose four vertical faces have different surfaces painted differently

14

sound waves are an example of what type of wave

longitudinal

15

waves along a string is an example of what type of wave

transverse

16

what are the qualities of P-waves

P-waves are longitudinal and therefore can travel through solids and liquids. however, there is a ring here the P-waves will not reach, due to the refraction of the outer core.

17

what are the qualities of S-waves

they are transverse and therefore travel slower than P-waves. they also cannot travel through the liquid of the outer core.