PhET Interference Lab 1. The single water faucet mimics a single point source wa

Question

PhET Interference Lab

1. The single water faucet mimics a single point source wave generator. Using this single point source generator, we find that a point souce generates ________ waves in 2-dimensions which translates to _______ waves in 3-dimensions.

a. circular; circular

b. circular; spherical

c. plane; box

d. plane; spherical

2. Add a single slit to the simulate and drag the slit nearer to the source. You can observe waves passing through the slit. These waves that are transmitted through the slit can be described as:

a. spherical waves.

b. planar waves

c. triangular waves.

d. linear waves.

3. Remove the slit and now use two sources. Make the distance between the source be about 6cm and increase the drip frequency to about half (move the slider to about the half position). This system shows clear interference between the waves that radiate from the two point sources. As you have learned in class, nodes are regions where the amplitude of the wave is zero at all times. Under these conditions you should be able to clearly see six and possibly eight nodes radiating from the point sources. What happens to the number of nodes that you see if you increase the frequency of the drips?

a. decrease

b. remains the same

c. increase

Explanation / Answer

Ans :

1. b. circular; spherical

2. a. spherical waves.

3.

Remove the slit and now use two sources. Make the distance between the source be about 6cm and increase the drip frequency to about half (move the slider to about the half position). This system shows clear interference between the waves that radiate from the two point sources. As you have learned in class, nodes are regions where the amplitude of the wave is zero at all times. Under these conditions you should be able to clearly see six and possibly eight nodes radiating from the point sources. What happens to the number of nodes that you see if you increase the frequency of the drips?

a. it decrease

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