Waves , Sound and lights

Question 1

Pulses

Answer 1

Disturbance in a medium

Question 2

Amplitude

Answer 2

Maximum displacement of a particle.

Question 3

Principle of Superposition

Answer 3

Algerbraic sum of the amplitudes of two pulses that occupy the same space at the same time.

Question 4

What happens when two pulses interact?

Answer 4

They do so constructively and destructively.

Question 5

Constructive interference?

Answer 5

Increased amplitude

Question 6

Destructive inteference?

Answer 6

Decreased amplitude

Question 7

1. Transverse Waves

Answer 7

The disturbance of a medium is perpendicular to the direction of the propagation of the wave.

Question 8

Crest

Answer 8

Highest point of disturbance

Question 9

Trough

Answer 9

Lowest point of disturbance

Question 10

Amplitude

Answer 10

Max displacement of a particle at rest

Question 11

Wavelength

Answer 11

Distance between 2 successive points that are in phase

Question 12

Frequency

Answer 12

Number of waves passing a given point in a second.
Waves per sec measured in Hertz(Hz)

Question 13

Period

Answer 13

Time taken for a single wave to pass a given point. Waves per sec Measured in seconds (T)

Question 14

Formulae for Period is?

Answer 14

T= 1/f

Question 15

Wavelength formula?

Answer 15

V= f x λ

Question 16

Longitudinal Waves

Answer 16

a wave in which the disturbance of a medium is parallel to the direction of propagation of the wave

Question 17

Wavelength

Answer 17

Distance between the centre of two successive compressions or two successive refractions

Question 18

Sound

Answer 18

Longitudinal waves which require a medium to travel in.
Cannot be produced if vibrations are not taking place.

Question 19

Density

Answer 19

Sound travels faster in a more dense medium due to particles being closer together. Able to pass energy quicker. Sound travels faster in a solid than in a liquid.

Question 20

Temperature

Answer 20

Higher the temp higher the kinetic energy . Particles travel faster and pass on energy quicker . Sound travels faster in mediums of high temperatures.

Question 21

The speed of sound air

Answer 21

340 m/s

Question 22

Pitch

Answer 22

Determined by sound waves frequency. Higher the freq of sound wave higher the pitch.

Question 23

Volume

Answer 23

Determined by sound waves amplitude. Higher the amplitude louder the sound.

Question 24

Tone

Answer 24

How regular sound waves are.

Question 25

Ultrasound

Answer 25

Sound frequencies that are higher than that audible to the human ear.
(20kHz)
Used by animals to detect prey