science exam Flashcards Preview

4th 9 Wks Exams > science exam > Flashcards

Flashcards in science exam Deck (20):
0

wave

repeating disturbance that transfers energy through matter or open space

1

mechanical waves

waves that use matter to transfer energy

2

medium

matter through which a mechanical wave travels

3

transverse waves

matter in the medium moves back-and-forth at right angles to the direction it travels

4

compressional waves

matter in the medium moves forward and backward in the direction the wave travels

5

what kind of waves are soundwaves?

compressional waves

6

why can't soundwaves travel in outerspace?

because they are mechanical waves

7

rarefaction

The region of a compressional wave where particles are far apart

8

electromagnetic waves

do not require matter to carry energy

9

amplitude

measure of the energy in a wave

10

wavelength

distance from crest to crest in a transverse wave

11

frequency

how many wavelengths pass a fixed point each second

12

compression

A group of molecules that are squeezed together

13

reflection

occurs when a wave strikes an object and bounces off of it

14

normal

an imaginary line perpendicular to the surface of the medium where wave strikes it

15

diffraction

when waves bend around a barrier

16

refraction

The bending of a lightwave as it moves from one medium into another

17

interference

process in which two waves overlap and form a new wave

18

destructive interference

when the crest of one wave overlaps the trough of another wave

19

constructive interference

when the crest of one wave overlaps the crest of another wave