Review - Flashlight without Batteries??

Can you figure this out?

Trig. Review

Made using a spreadsheet created by Dan Hosey - Pittsford Sutherland HS

http://www.box.net/shared/ac55l0keyv / http://www.youtube.com/watch?v=gX3-4serqwk

At which positions do you find the following degrees?

0 degrees	90 degree	180 degrees	270 degrees	360 degrees
0.0 m	3 m	6m	9 m	12 m

Transverse wave - medium move in 2 directions

Remove your mouse from the animation to stop it.

St. Mary's H.S. Physics

A. Phase

"In Phase" (0° difference) – points on a single periodic wave that have the same displacement (from equilibrium position) and moving in the same direction

Whole number of wavelengths apart?

A & ____ A & ____ B & ___ B & ___

A & E, A & I, A & M

B & _, B & _, B & _

B & F, B & J, B & N

"Out of Phase"– (180⁰difference)

- same displacement from equilibrium position but going in a different direction

½, 1½, 2½ etc wavelengths apart

A & C, B & D, F & H

Which 2 points are in phase?

C and F

2 points that are 180°
out of phase?

B and D

E and G

B. Wavelength – distance between two consecutive points in phase

determined by medium

symbol λ = lambda

Wavelength
St. Mary's Physics Online

- length of one cycle #m/cycle

Wavelength?

Made using a spreadsheet created by Dan Hosey - Pittsford Sutherland HS

http://www.box.net/shared/ac55l0keyv / http://www.youtube.com/watch?v=gX3-4serqwk

4 meters

Ex) Wavelength?

June 2000 Regents

λ = 5.0 m/2.5 cycles

λ = 2.0 m

Ex)

Amplitude? Wavelength?

Amplitude = .10 m

Wavelength = .60 m

Ex)

Amplitude A?, B?, C?

Jan 2004

Wave Speed