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4) Light with a wavelength of 632.8 nm illuminates two narrow slits 105 μm apart. What...

4) Light with a wavelength of 632.8 nm illuminates two narrow slits 105 μm apart. What is the angle to the m=4 bright fringe (in degrees)?

5. Two loudspeakers are facing each other 50 m apart and are emitting identical sinusoidal sound waves at a frequency of 68.5 Hz. A person walking from one speaker to the other moves through loud and quiet spots. If the person stands 30 meters from the left speaker, is he standing in a quiet or loud spot?

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