waves interim

Question 1

electromagnetic radiation

Answer 1

waves of energy produced by changing electric and magnetic fields

Question 2

electromagnetic spectrum

Answer 2

the arrangement of electromagnetic waves according to wavelength

Question 3

wave

Answer 3

a repeating disturbance of movement that transfers energy through matter or space, waves are caused by vibrations

Question 4

medium

Answer 4

the matter through which a wave travels

Question 5

transverse wave

Answer 5

a wave in which matter in the medium moves back and forth at a right angle to the direction the wave travels

Question 6

compressional wave

Answer 6

a wave in which the matter in the medium moves back and forth in the same direction that the wave travels

Question 7

crest

Answer 7

the high point of a transverse wave

Question 8

trough

Answer 8

the low point of a transverse wave

Question 9

wavelength

Answer 9

the distance between two crests or troughs on a wave

Question 10

frequency

Answer 10

the number of waves that pass through a given point per second

Question 11

period

Answer 11

the amount of time it takes one wavelength to pass a fixed point

Question 12

amplitude

Answer 12

the measure of the energy that a wave carries

Question 13

velocity =

Answer 13

frequency * wavelength

Question 14

speed of light

Answer 14

300,000 km/second

Question 15

light year

Answer 15

the distance that light travels in one year - 9.46 trillion km

Question 16

astronomical unit

Answer 16

the average distance between the earth and the sun - 150 million km

Question 17

why are special units needed to measure distances in space?

Answer 17

because space is so huge, it would be impractical to use normal units

Question 18

the arrangement of electromagnetic waves according to wavelength is called…

Answer 18

the electromagnetic spectrum

Question 19

which part of the electromagnetic spectrum do human eyes detect?

Answer 19

visible light spectrum

Question 20

colors result from the fact that each color of light has a different…

Answer 20

wavelength

Question 21

relationship between frequency and wavelength:

Answer 21

the higher the frequency, the shorter the wavelength.

the longer the wavelength, the lower the frequency.

Question 22

which wavelengths carry the most energy? (length and color)

Answer 22

shorter, blue

Question 23

how is amplitude measured?

Answer 23

finding the distance between the crest/trough and rest position. the taller the wave, the greater the energy/amplitude

Question 24

x-rays

Answer 24

used to make images of the body

Question 25

microwaves

Answer 25

used in cell phones, bluetooth, microwave ovens

Question 26

gamma rays

Answer 26

used to treat cancer

Question 27

ultraviolet

Answer 27

found in sunlight, causes skin cancer

Question 28

infrared

Answer 28

“below red” used in toasters and grills and remote controls

Question 29

radio waves

Answer 29

longest wavelength in the spectrum, used to transmit radio and tv signals