P12

Question 1

WHAT IS A WAVES JOB?

Answer 1

Transfer energy from one place to another

Question 2

WHAT DO WAVES NOT TRANSFER?

Answer 2

matter

Question 3

WHAT IS THE RELATIONSHIP BETWEEN WAVE DIRECTION AND ENERGY TRANSFER?

Answer 3

Direction wave travels is the same direction energy is transferred

Question 4

HOW DO WAVES MOVE?

Answer 4

Oscillation of particles

Question 5

WHAT DIRECTION ARE TRANSVERSE WAVES OSCILLATIONS?

Answer 5

Up and down they are perpendicular to waves energy transfer

Question 6

WHAT DIRECTION ARE LONGITUDIAL WAVES OSCILLATIONS?

Answer 6

Left to right they are parallel to waves energy transfer

Question 7

GIVE AN EXAMPLE OF A TRANSVERSE WAVE?

Answer 7

A water wave or electromagnetic waves

Question 8

GIVE AN EXAMPLE OF A LONGITUDIAL WAVE?

Answer 8

A spring contacting and relaxing

Question 9

MECHANICAL WAVES CAN…

Answer 9

Travel through a medium
they can be transverse and longitudial

Question 10

ELECTROMAGNETCI WAVES CAN…

Answer 10

Travel through a vacuum they are only transverse

Question 11

GIVE AN EXAMPLE ELECTROMAGNETIC WAVES?

Answer 11

Light wave or Radio wave

Question 12

WHAT IS AMPLITUIDE?

Answer 12

Height of wave crest or depth of wave trough from midpoint of wave

Question 13

WHAT IS WAVELENGTH?

Answer 13

distance of wave from crest to crest or trough to trough

Question 14

THE GREATER THE AMPLITUIDE OF THE WAVE?

Answer 14

the more energy it is transferring

Question 15

WHAT IS FREQUENCY?

Answer 15

Frequency is the number of waves that pass a point in 1 second

Question 16

WHAT IS FREQUENCY MEASURED IN?

Answer 16

Hz

Question 17

WHAT IS THE EQUATION FOR FREQUENCY?

Answer 17

f =1/Time

Question 18

WHAT IS THE PERIOD OF A WAVE?

Answer 18

Time taken for one wavelength to pass a point

Question 19

WHAT IS THE EQUATION FOR PERIOD OF WAVE?

Answer 19

Period of wave=1/ Frequency

Question 20

WHAT IS EQUATION FOR WAVESPEED?

Answer 20

wavespeed= frequency x wavelength
v (m/s)= f (Hz) x Wavelength (m)

Question 21

WHEN A WAVE MEETS A BOUNDARY WHAT THREE THINGS CAN HAPPEN?

Answer 21

-Absorbtion
- Transmittion
- Reflelection

Question 22

WHAT IS ABSORBTION?

Answer 22

When energy is transferred directly from wave to material

Question 23

WHAT IS TRANSMITTION?

Answer 23

When wave passes through a medium

Question 24

WHAT IS REFLECTION?

Answer 24

When wave does not enter material at all

Question 25

WHEN DOES REFLECTION OCCUR?

Answer 25

When there is no change in wavespeed or length

Question 26

ON A REFLECTION RAY DIAGRAM WHERE IS THE NORMAL?

Answer 26

perpendicular and 90 degrees from the boundary

Question 27

WHAT IS THE RULE FOR ANGLES ON A REFLECTION RAY DIAGRAM?

Answer 27

Angle of incidence= Angle of reflection

Question 28

WHEN DOES SPECULAR REFLECTION OCCUR?

Answer 28

When normal are all in same direction and 90 degrees from boundary

Question 29

GIVE AN EXAMPLE OF A SURFACE WHERE SPECULAR REFLECTION WOULD OCCUR?

Answer 29

A mirror

Question 30

WHEN DOES SCATTERED REFLECTION HAPPEN?

Answer 30

When surface is rough so direction of normals is irregular

Question 31

EXPLAIN WHY REFRACTION HAPPENS?

Answer 31

Because waves change speed and wavelength when they cross a boundary of two different mediums, if the wave does not meet the medium at directly 90 degrees refraction occurs.

Question 32

WHY DO WAVES TRAVEL AT DIFFERENT SPEEDS IN DIFFERENT MEDIUMS?

Answer 32

BECAUSE DIFFERENT MEDIUMS HAVE DIFFERENT DENISITIES

Question 33

THE HIGHER THE DENISITY OF AN OBJECT?

Answer 33

The slower the wave moves through it

Question 34

IF A MEDIUM IS MORE DENSE THE RAY WILL...

Answer 34

Bend towards the normal

Question 35

WHAT ARE WAVES THAT CARRY ANY KIND OF SIGNAL CALLED?

Answer 35

Carrier waves

Question 36

WHAT TWO WAVES ARE USED FOR COMMUNICATIONS ?

Answer 36

Radiowaves and microwaves

Question 37

WHEN IT COMES TO COMMUNICATIONS THE SHORTER THE WAVELENGTH..

Answer 37

the more information that can be carried bu can only travel a shorter range

Question 38

WHAT ARE OPTICAL FIBRES AND HOW DO THEY WORK?

Answer 38

Optical fibres are tubes are glass that carry visible light waves through specular reflection. visible light waves have shorter wavelength so can carry more information

Question 39

WHY ARE MICROWAVES USED FOR SATELLITE AND PHONE?

Answer 39

because they can travel through atmposphere