continuing ch12 then the rest

this week will have a lab, we must study it before coming

YOU NEED YOU BRING YOUR LAPTOP

quiz too

chapter 12 (doppler and somethng else i forgot)

• imagine a siren of a fire bridgae

as it approaches → we hear a high pitch sound

as it passes thru → low pitch low frequency

obviously. there is a change in frequency

simulation of this.

you have a source that creates circular waves