waves

Question 1

A transverse wave is …

Answer 1

When the motion of particles are perpendicular to direction of wave

Question 2

Examples of tranverse waves

Answer 2

• light
• water
• EM waves

Question 3

A longitudinal wave is…

Answer 3

When the motion of the particles are parallel to direction of the wave

Question 4

Examples of longitudinal waves

Answer 4

• sound
• spring
• slinky

Question 5

Frequency =

Answer 5

Number of complete waves passing a fixed point per second

Question 6

Time period=

Answer 6

Time taken for one complete wave to pass a fixed point

Question 7

Speed of light in air

Answer 7

3 x 10^8

Question 8

Maximum diffraction

Answer 8

when gap size equal to wavelength

Question 9

Does interference affect digital?

Answer 9

No, the signal can still be decoded

Question 10

What is an virtual image?

Answer 10

An image which cant be projected on a screen

Question 11

What happens when light hits a rough surface?

Answer 11

It still obeys law of reflection but since the direction of normal is different for each ray, the light is scattered

Question 12

What is refraction?

Answer 12

When light passes from one medium to another Slows down and changes direction

Question 13

Refractive index of vacuum =

Answer 13

1

Question 14

Refractive index of water =

Answer 14

1.33

Question 15

Refractive index of glass =

Answer 15

1.5

Question 16

TIR occurs when…

Answer 16

Angle of incidence is above critical angle

Question 17

Critical angle for glass =

Answer 17

42

Question 18

Critical angle for water =

Answer 18

49

Question 19

Why is diamond sparkly?

Answer 19

• high refractive index of 2.4
• low critical angle
• more TIR
• more sparkly

Question 20

Sound is caused by …

Answer 20

Mechanical vibrations

Question 21

Speed of sound in air

Answer 21

330 m/s

Question 22

speed of sound in water

Answer 22

1400 m/s

Question 23

A microphone converts …

Answer 23

Changing air pressure from a sound wave into an alternate electrical voltage that can be viewed on an oscilloscope

Question 24

Quality of sound depends on …

Answer 24

Shape of wave

Question 25

Loudness depends on …

Answer 25

Amplitude

Question 26

Pitch depends on ..

Answer 26

Wavelength

Question 27

EM spectrum

Answer 27

• radiowaves
• microwaves
• infra red radiation
• visible light
• ultra violet
• x-rays
• gamma rays

Question 28

Uses of:

• Radio waves
• Microwaves
• Infra-red radiation
• Visible Light
• X-rays
• Ultra Violet
• Gamma rays

Answer 28

• communication/broadcast
• cooking/satellites
• night vision/heating
• photo/optic fibres
• observing internal structure
• fluorescent lamps
• irradiating food/ sterilising equipment

Question 29

Dangers of:

• Microwaves
• Infra-red
• Ultraviolet
• Gamma rays

Answer 29

• internal heating
• skin burns
• blindness/damage to surface cells
• cancer/mutation