Waves 4.1 - 4.2

Question 1

Waves that pass through a substance are

Answer 1

Vibrations that pass through a substance

Question 2

Waves that pass through a substance are often referred to as

Answer 2

Mechanical waves

Question 3

Electromagnetic waves are

Unlike mechanical waves

Answer 3

Oscillating electric and magnetic fields that progress through space without need for a substance

Question 4

Electromagnetic waves include

R m i l u x g

Answer 4

Radio waves 
Micro waves
Infrared radiation
Light
Ultraviolet radiation
X rays
Gamma radiation

Question 5

Longitudinal waves are waves in which the direction of vibration of the particles is

Answer 5

Parallel to (along) the line in which the wave travels

Question 6

Longitudinal waves include

Answer 6

Sound waves, primary seismic waves, compression waves on a slinky toy

Question 7

For longitudinal waves, ‘forward’ movement causes a - wave

Reverse movement causes the coil to move apart so - (expansion) wave passes along slinky

Answer 7

Compression

Rarefaction

Question 8

Transverse waves are waves in which the direction of vibration is

Answer 8

Perpendicular to the direction in which the wave travels

Question 9

Transverse waves are - if the vibrations stay in one plane only

Answer 9

Plane polarised

Question 10

If the vibrations change from one plane to another, the waves are

Answer 10

Unpolarised

Question 11

Longitudinal waves cannot be

Answer 11

Polarised

Question 12

The plane of polarisation of an electromagnetic wave is defined as

Answer 12

The plane in which the electric field oscillates

Question 13

The displacement of a vibrating particle is its distance and direction

Answer 13

From its equilibrium position

Question 14

The amplitude of a wave is the maximum displacement of

Answer 14

A vibrating particle

Question 15

The wavelength of a wave is

Answer 15

The least distance between two adjacent vibrating particles with the same displacement and velocity at the same time

(Distance between adjacent crests )

Question 16

One complete cycle of a wave is from

Answer 16

Max displacement to the next max displacement

One peak to next

Question 17

The period of a wave is the time for one complete war to pass a

Answer 17

Fixed point

Question 18

The frequency of a wave is the number of

Answer 18

Cycles of vibration of a particle per second

Or no. Of complete waves passing a point per sec

Question 19

Unit of frequency is

Answer 19

Hz

Question 20

For waves of frequency f, the proof of the wave is

Answer 20

f

Question 21

Wave speed =

Answer 21

C = fλ

Question 22

λ

Answer 22

Wavelength

Question 23

The phase difference in radians=

Distance

Answer 23

λ