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A Level Physics > Chapte 11 > Flashcards

Chapte 11 Flashcards

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1
Q

What are waves?

A

A physical phenomenon where it transfers energy through a medium without transferring matter

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2
Q

What are the 2 types of waves?

A

Mechanical- particles of a medium oscillate

EM-electrostatic and magnetic fields in a medium vibrate

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3
Q

What are the modes of vibration?

A

Transverse-direction of oscillation is perpendicular to direction of energy transfer
Longitudinal-direction of oscillation is parallel to direction of energy transfer

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4
Q

What is displacement?

A

Distance and direction of a vibration particle from a equilibrium position

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5
Q

What is the amplitude?

A

Maximum displacement of a vibration particle from the equilibrium position

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6
Q

What is the wavelength?

A

Distance between 2 adjacent vibration particles with same velocity at same displacement

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7
Q

What is the period?

A

Time taken for a particle to complete one oscillation

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8
Q

What is the frequency?

A

Number of complete oscillations performed per second by a particle

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9
Q

What is the wave equation?

A

Frequency*wave length=wave speed

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10
Q

What is the phase?

A

Fraction of a complete cycle that a particle is at

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11
Q

What is the phase difference?

A

The difference in phase between 2 points along the same wave or 2 waves at any given point

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12
Q

What are wavefronts?

A

Lines of constant phase

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13
Q

What is the law of reflection?

A

Angle of incidence=angle of reflection

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14
Q

What is diffraction?

A

It’s the physical phenomenon of waves spreading out when passing through a gap

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15
Q

What is the intensity equation?

A

I=P/A or I=P/4pi r^2

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16
Q

Order of electromagnetic spectrum

A 
Radio waves
Micro waves
Infrared waves
Visible light
Ultraviolet 
X rays
Gamma rays
17
Q

What are polarised filters?

A

Only allows EM waves which are polarised in the same plane to pass through

18
Q

What is refraction?

A

When a wave changes direction when crossing the boundary between 2 different media

19
Q

Refractive index

A

n=c/v

The greater the decrease in speed, the greater the refractive index of the medium and the more the light refracts

20
Q

Refractive index and angle of incidence and refraction

A

n1sin(01)=n2sin(02)
n1=refractive index of medium 1
n2=refractive index of medium 2
01=angle of incidence/refraction in medium 1
02=angle of incidence/refraction in medium 2

21
Q

What is critical angle?

A

Angle where if the angle of incidence exceeds it, the angle of refraction is 90°

22
Q

What must occur for total internal reflection to take place?

A

Critical angle must be exceeded

Refractive index of first medium must be higher than that of the second medium

23
Q

Equation for TIR

A

Sin0=n2/n1

A Level Physics (8 decks)

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