Year 9 Physics Flashcards Preview

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Flashcards in Year 9 Physics Deck (16):
1

Define Wave...

A wave is a transmitter of energy without the movement of particles from place to place. The vibration of particles or energy fields is involved.

2

Define Transverse Waves...

wave involving the vibration of particles perpendicular to the direction of energy transfer

3

Define Compression Waves ...

wave involving the vibration of particles in the same direction as energy transfer

4

What is Longitudinal wave?

Another word for compression wave.

5

Define a Medium...

material through which a wave moves

6

Vibration

repeated fast back-and-forth movements

7

Define Compression ...

region in which the particles are closer than when not disturbed by a wave

8

Define Rarefaction...

region in which the particles are further apart than when not disturbed by a wave

9

Define Frequency...

number of vibrations in one second, or the number of wavelengths passing in one second

10

Define Pitch...

highness or lowness of a sound. The pitch that you hear depends on the frequency of the vibrating air.

11

Define Hertz...

unit of frequency; its abbreviation is Hz. One hertz is equal to one vibration every second.

12

Define Wavelength...

distance between two neighbouring crests or troughs of a wave. This is the distance between two particles vibrating in step.

13

Define Amplitude...

maximum distance that a particle moves away from its undisturbed position

14

Define Sonar ( SOund Navigation and Ranging )...

use of reflected sound waves to locate objects under water (sound navigation and ranging)( SOund Navigation and Ranging )

15

Define Echolocation...

use of sound to locate objects by detecting echoes

16

Define Ultrasound

sound with frequencies too high for humans to hear