module 14

Question 1

a wave produced by the acceleration of an electric charge and propagated by the periodic variation of intensities of, usually, perpendicular electric and magnetic fields.

Answer 1

electromagnetic waves.

Question 2

the highest point on the wave is the __________

Answer 2

crest

Question 3

the lowest point on the wave is the ___________

Answer 3

trough

Question 4

the distance between the crests are the __________

Answer 4

wavelengths

Question 5

the height of the wavelength is the ____________

Answer 5

amplitude

Question 6

the number of waves that occur in a second

Answer 6

frequency

Question 7

frequency and wavelength are related through the speed of the wave, this formula looks like this:

Answer 7

f= v/(lambda)

Question 8

what is a transverse wave?

Answer 8

a wave whose propagation is perpendicular to its oscillation.

Question 9

oscillation is what?

Answer 9

movement back and forth

Question 10

what are longitudinal waves?

Answer 10

waves whose propagation is parallel to its oscillation

Question 11

the unit for frequency is the ____________

Answer 11

Hertz

Question 12

who discovered radio waves?

Answer 12

Heinrich Rudolph Hertz

Question 13

medium is the what in physics?

Answer 13

“the stuff” the waves move through

Question 14

what is supersonic speed?

Answer 14

any speed faster than the speed of sound in the substance of interest.

Question 15

what is a sonic boom?

Answer 15

the sound produced as a result of aircraft traveling at or above Mach 1

Question 16

The speed unit of a jet’s speed in terms of the speed of sound is called __________

Answer 16

Mach

Question 17

The highness or lowness of a sound is it’s ___________

Answer 17

pitch

Question 18

sonic waves are ____________ waves, ones we can hear with the human ear.

Answer 18

sound

Question 19

sound waves with frequencies higher than 20,000Hz are called ____________

Answer 19

ultrasonic.

Question 20

sound waves with frequencies lower than 20HZ are called ____________

Answer 20

infrasonic.

Question 21

the _______________ of a sound wave governs how loud the sound is.

Answer 21

amplitude

Question 22

the special scale used to measure loudness of a sound is the ___________

Answer 22

bel scale. (named in honor of Alexander Graham Bell)

Question 23

The bel scale measures ___________ of a sound wave

Answer 23

intensity or amplitude squared.

Question 24

An increase in the bel scale by one corresponds to a ___ increase in the sound wave intensity

Answer 24

ten-fold (10x)

Question 25

physical damage can occur in the ear when sounds reach __bels.

Answer 25

13

Question 26

sonar is the use of ______________waves that are emitted, and then bounce off surfaces back to a receiver.

Answer 26

ultrasonic.