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Year 9 Physics > Waves Continuted > Flashcards

Waves Continuted Flashcards

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0
Q

Refraction

The __________ travels __________ in a ______ or a vacuum and _________ and _________.

A

Refraction

The light travels fastest in a gas or a vacuum and solids and liquids.

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1
Q

Refraction

Light ________ at ____________ ______ through different ____________.

A

Refraction

Light travels at different speeds through different substances.

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2
Q

Refraction

Sound travels fastest through a ________.

A

Sound travels fastest through a solid.

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3
Q

If the angle of incidence is smaller than the critical angle, what occurs ?

A

Refraction

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4
Q

If the angle of incidence is greater than the critical angle the light is …

A

Reflected

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5
Q

What is wave length ?

A

The distance between to crests next to each other in metres

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6
Q

What is amplitude

A

The amplitude us the maximum displacement of the wave.

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7
Q

What is frequency.

A

The number of waves passing a point in 1 second (hertz)

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8
Q

What is Time period

A

This is the time for one wave in seconds

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9
Q

H =

2

A

Hertz

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10
Q

A =

A

A = amplitude

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11
Q

I=

R=

A 
I= angle of incidence 
R= angle of reflection
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12
Q

Equation for velocity in waves

A

V = f x λ

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13
Q

Danger of electro magnetic radiation

Gamma rays and X-rays ?

A

Because if there high frequency they are dangerous
Gamma rays can be used to kill cancer cells with a laser
Gamma rays and X-rays can cause mutation and cancer

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14
Q

Danger of electro magnetic radiation

Ultra violet ?

A

Ultra violet Rays can cause nutation and skin cancer

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15
Q

Why is an X-ray image seen ?

A

Because the bone absorbs it

16
Q

Which type of electromagnetic wave is used when a traffic light signal communicates with a car driver?

A

Visual light

17
Q

What is the order of the 7 types in the electromagnetic spectrum ?

A 
Radio 
Microwave
Infrared 
Visual light 
Ultra violet 
X-rays 
Gamma rays
18
Q

What are the uses for the 7 types of wave in the electromagnetic spectrum?

A

Radio - communication
Microwave- satellite communication
Infrared - heating, monitoring temperature
Visual light - photography
Ultra violet - fluorescent lamps
X-rays - lets us see through objects
Gamma rays - to sterilise medical equipment (kills microbes)

19
Q

Equation for frequency

A

F= 1/T

20
Q

Equation for speed ?

A

S= d/T

Year 9 Physics (2 decks)

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