Learning Goal: To understand the assumptions made by the standard two-source int

Question

Learning Goal: To understand the assumptions made by the standard two-source interference equations and to be able to use them in a standard problem. For solving two-source interference problems, there exists a standard set of equations that give the conditions for constructive and destructive interference. These equations are usually derived in the context of

A) Which of the following statements explain why the two-source interference equations are not valid for an observer far away from two red LED signal lights?

a) 1 only
b) 2 only
c) 3 only
d) 1 and 2 only
e) 1 and 3 only
f) 2 and 3 only
g) all three

B) Why are the two-source interference equations not valid for an observer on a road far away from two neighboring radio towers for different radio stations?

a) 1 only
b) 2 only
c) 3 only
d) 1 and 2 only
e) 1 and 3 only
f) 2 and 3 only
g) all three

C) Why are the two-source interference equations not valid for light from an incandescent bulb that shines onto a screen with a single slit, and then the light shines onto a screen with two slits in it and the light from the two slits finally shines onto a nearby screen?

a) 1 only
b) 2 only
c) 3 only
d) 1 and 2 only
e) 1 and 3 only
f) 2 and 3 only
g) all three

E) Consider a road that runs parallel to the line connecting a pair of radio towers that transmit the same station (assume that their transmissions are synchronized), which has an AM frequency of 1000 kilohertz. If the road is 5 kilometers from the towers and the towers are separated by 400meters, find the angle ? to the first point of minimum signal (m=0). Hint: A frequency of 1000 kilohertz corresponds to a wavelength of 300meters for radio waves.

theta = __________radians

Explanation / Answer

A) An observer stands on a road that runs five kilometers away from the two synchronized transmitting towers for a radio station.

B) 2 only

C) 1 and 2 only

D) 1 and 3 only

E) 0.38 radians

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