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Matt Hansn

20 Apr 2023

Simon Merrick

MattKirkwood

Ethan Sheddan

Ivan Piersanti

Connor Tyndall

Andrew Sanders

Max Madgwick-Pamment

Gabriel Borg

Tim Oorschot

Guy Whitman

Bill Reimer

Callum Snell

Alex Woo

Mac Greenslade

Jonathan Wardman

Jack Palmer

White light entering prism

Complete the ray diagram to show how white light is dispersed through the prism to form the spectrum of colours

Do now:

Label the colours of the spectrum in order

Does blue or red have the longer wavelength?

Does blue or red have the higher frequency?

white light

Thursday, April 20, 2023

“Violet is bent most violently”

Red has longer wavelength / lower frequency compared to blue

white light

Violet

RedOrange

YellowGreen

BlueIndigo

normal

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2) Pay $9.50 to payment centre

3) H/W due tomorrow (Friday) – it should be finished & marked http://cashmerephysics.wikispaces.com

Today’s Learning: LO3: Explain the Doppler effect

1) Video clips

2) Diagram + written explanation

3) Worksheet

4) Fun finish: Sheldon

The Doppler Effect

The change in the apparent frequency of a wave due to the motion of the wave

source

e.g. the engine noise of an F1 car as it drives past. It sounds higher when it is

coming toward you, lower when it is going away

1842, Prague

How it happens

• Waves (eg sound) move out in all directions from the source at speed vw

• Two observers standing either side of the source will both hear the same frequency as the wavelength reaching their ears is the same.

vw

How it happens

• If the source is moving with speed vs then the wavelength observed by the person in front of the source will be shorter (and hence the pitch higher) than the observer standing behind

vs