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PHYSICS > P12 > Flashcards

P12 Flashcards

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1
Q

WHAT IS A WAVES JOB?

A

Transfer energy from one place to another

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2
Q

WHAT DO WAVES NOT TRANSFER?

A

matter

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3
Q

WHAT IS THE RELATIONSHIP BETWEEN WAVE DIRECTION AND ENERGY TRANSFER?

A

Direction wave travels is the same direction energy is transferred

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4
Q

HOW DO WAVES MOVE?

A

Oscillation of particles

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5
Q

WHAT DIRECTION ARE TRANSVERSE WAVES OSCILLATIONS?

A

Up and down they are perpendicular to waves energy transfer

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6
Q

WHAT DIRECTION ARE LONGITUDIAL WAVES OSCILLATIONS?

A

Left to right they are parallel to waves energy transfer

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7
Q

GIVE AN EXAMPLE OF A TRANSVERSE WAVE?

A

A water wave or electromagnetic waves

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8
Q

GIVE AN EXAMPLE OF A LONGITUDIAL WAVE?

A

A spring contacting and relaxing

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9
Q

MECHANICAL WAVES CAN…

A

Travel through a medium
they can be transverse and longitudial

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10
Q

ELECTROMAGNETCI WAVES CAN…

A

Travel through a vacuum they are only transverse

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11
Q

GIVE AN EXAMPLE ELECTROMAGNETIC WAVES?

A

Light wave or Radio wave

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12
Q

WHAT IS AMPLITUIDE?

A

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

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13
Q

WHAT IS WAVELENGTH?

A

distance of wave from crest to crest or trough to trough

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14
Q

THE GREATER THE AMPLITUIDE OF THE WAVE?

A

the more energy it is transferring

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15
Q

WHAT IS FREQUENCY?

A

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

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16
Q

WHAT IS FREQUENCY MEASURED IN?

A

Hz

17
Q

WHAT IS THE EQUATION FOR FREQUENCY?

A

f =1/Time

18
Q

WHAT IS THE PERIOD OF A WAVE?

A

Time taken for one wavelength to pass a point

19
Q

WHAT IS THE EQUATION FOR PERIOD OF WAVE?

A

Period of wave=1/ Frequency

20
Q

WHAT IS EQUATION FOR WAVESPEED?

A

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

21
Q

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

A

-Absorbtion
- Transmittion
- Reflelection

22
Q

WHAT IS ABSORBTION?

A

When energy is transferred directly from wave to material

23
Q

WHAT IS TRANSMITTION?

A

When wave passes through a medium

24
Q

WHAT IS REFLECTION?

A

When wave does not enter material at all

25
Q

WHEN DOES REFLECTION OCCUR?

A

When there is no change in wavespeed or length

26
Q

ON A REFLECTION RAY DIAGRAM WHERE IS THE NORMAL?

A

perpendicular and 90 degrees from the boundary

27
Q

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

A

Angle of incidence= Angle of reflection

28
Q

WHEN DOES SPECULAR REFLECTION OCCUR?

A

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

29
Q

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

A

A mirror

30
Q

WHEN DOES SCATTERED REFLECTION HAPPEN?

A

When surface is rough so direction of normals is irregular

31
Q

EXPLAIN WHY REFRACTION HAPPENS?

A

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.

32
Q

WHY DO WAVES TRAVEL AT DIFFERENT SPEEDS IN DIFFERENT MEDIUMS?

A

BECAUSE DIFFERENT MEDIUMS HAVE DIFFERENT DENISITIES

33
Q

THE HIGHER THE DENISITY OF AN OBJECT?

A

The slower the wave moves through it

34
Q

IF A MEDIUM IS MORE DENSE THE RAY WILL…

A

Bend towards the normal

35
Q

WHAT ARE WAVES THAT CARRY ANY KIND OF SIGNAL CALLED?

A

Carrier waves

36
Q

WHAT TWO WAVES ARE USED FOR COMMUNICATIONS ?

A

Radiowaves and microwaves

37
Q

WHEN IT COMES TO COMMUNICATIONS THE SHORTER THE WAVELENGTH..

A

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

38
Q

WHAT ARE OPTICAL FIBRES AND HOW DO THEY WORK?

A

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

39
Q

WHY ARE MICROWAVES USED FOR SATELLITE AND PHONE?

A

because they can travel through atmposphere

PHYSICS (14 decks)

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