E.  Wave Front – locus of adjacent points on a wave which are in phase

 

Top View

Ex) Distance between arrows
= .90 cm

 

Wavelength of  wave?

 

 

 

 

 

 

λ = .30 m

 

 

 

III. Periodic Wave Phenomena

 

 

 

- Paul Hewitt

 

 

 

 

Beats - When Sounds Overlap (Video)

 

- Bob Barrett

 

 

 

Interference – effect produced by two waves passing simultaneously through a region

 

 

Interference -  1 | 2 | 3 |

(Right Click, Save As, Open)

Doane College

 

 


1. Superposition – when waves overlap, the resultant displacement is the algebraic sum of the individual displacements of each wave

 

 

Superposition

Monterey Institute

 

 

 

a) Constructive Interference

 

 

 

Constructive Interference

 

(Jason P. - 2005)

 

 

 

1)

 

 

 

 

 

 

2)

Amplitude?

 

 

2A

 

 

 

3)

 

 

 

Waves reemerge as separate waves

 

 

 

 

Constructive Interference II

(R. Meija - 2005)

 

 

 

b) Destructive Interference

 

 

Destructive Interference

(Jason P. - 2005)

 

 

 

 

 

 

 

 

 

1.

 

 

 

 

 

 

2.

At moment of overlap, amplitudes cancel (for a moment)

 

 

 

 

 

3.

Waves reemerge as separate waves

 

 

 

 

 

 

 

 

 

 

 

 

As the two waves below

pass through each

other, the medium at

point P will ...

(1) vibrate up and down

(2) vibrate left and right

(3) vibrate into and out of the page

(4) remain stationary

June 2004

 

 

 

 

 

(4) remain stationary

 

 

 

 

 

What will the amplitude

of the resultant wave be

when wave A and B

meet at point X?

Jan. 2004

 

 

 

 

 

+1

 

 

 

 

 

What is the amplitude

of the wave produced

when these waves

overlap?

June 2009

 

 

 

15 cm

 

 

 

 

 

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