Mechanical and Electromagnetic Waves

Question 1

a disturbance traveling through a medium or in vacuum

Answer 1

wave

Question 2

A single unrepeated disturbance is called a _____.

Answer 2

wave pulse

Question 3

A succession of periodic disturbances is called a _____.

Answer 3

wave train

Question 4

Waves are classified according to their nature and according to their

Answer 4

direction of vibrations

Question 5

require a material medium to propagate

Answer 5

Mechanical Waves

Question 6

can travel in vacuum and in material media

Answer 6

Electromagnetic waves

Question 7

Based on the direction of vibrations, mechanical waves may be ____ or ____.

Answer 7

longitudinal or transverse.

Question 8

_______ is one in which the particles of the medium are vibrating perpendicularly to the direction of wave propagation

Answer 8

transverse wave

Question 9

top of the hill

Answer 9

crest

Question 10

bottom of the valley

Answer 10

trough

Question 11

position of maximum upward displacement from equilibrium

Answer 11

crest

Question 12

position of maximum downward displacement from equilibrium

Answer 12

trough

Question 13

particles of the medium vibrate parallel to the direction of wave propagation.

Answer 13

longitudinal waves

Question 14

composed of compressions where particles of medium are closer together and rarefactions where they are farther apart.

Answer 14

longitudinal waves

Question 15

crest in transverse waves

Answer 15

compressions

Question 16

trough in transverse waves

Answer 16

rarefactions

Question 17

Seismic waves (two)

Answer 17

Body waves & Surface waves

Question 18

Body waves (two)

Answer 18

Primary & Secondary waves

Question 19

Surface waves (two)

Answer 19

Love & Rayleigh waves

Question 20

Oscillating charge -> oscillating electric field -> ___

Answer 20

oscillating magnetic field

Question 21

produced by oscillating electric charges with the electric field and magnetic field vibrating perpendicularly with each other and to the direction of wave propagation.

Answer 21

Electromagnetic waves

Question 22

In 1862, _______ predicted the existence of electromagnetic waves.

Answer 22

James Clerk Maxwell

Question 23

In ______, James Clerk Maxwell predicted the existence of electromagnetic waves.

Answer 23

1862

Question 24

1887, through the efforts of ______, when those waves (except light) were observed to exist.

Answer 24

Heinrich Hertz

Question 25

____, through the efforts of Heinrich Hertz, when those waves (except light) were observed to exist.

Answer 25

1887

Question 26

classified according to their frequencies or wavelengths.

Answer 26

electromagnetic waves

Question 27

a term used to describe the entire range of electromagnetic radiations arranged in the order of their frequencies or wavelengths.

Answer 27

Electromagnetic spectrum

Question 28

the longest of all electromagnetic waves, ranging from 10^-1 m to 10^4m.

Answer 28

Radio waves

Question 29

are extremely high frequency radio waves.

Answer 29

Microwaves

Question 30

______ was credited for discovering microwaves in 1864.

Answer 30

James Clerk Maxwell

Question 31

____ have longer wavelengths than red. Their wavelengths range from 7x10^-7m to 10^-3m

Answer 31

Infrared rays

Question 32

identified infrared rays about 1800.

Answer 32

Sir William Herschel

Question 33

heat waves

Answer 33

infrared rays

Question 34

is the part of the electromagnetic spectrum visible to our unaided eye.

Answer 34

Light

Question 35

discovered the ultraviolet rays

Answer 35

Johann Wilhelm Ritter

Question 36

are thousand times shorter than the Shortest visible light and have very high frequencies.

Answer 36

X-rays or Roentgen rays