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# Physical Optics and Interference

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Moe, Larry, and Curly sit in a line with a spacing of 1.00 m. Larry is d1 = 3.0 m in front of a pair of stereo speakers d2 = 0.800 m apart, as shown in Figure 28-33. The speakers produce a single-frequency tone, vibrating in phase with each other. What are the two lowest frequencies that allow Larry to hear a loud tone while Moe and Curly hear very little? (Take the speed of sound to be 343 m/s.)

(a) lowest frequency

(b) second lowest frequency

https://brainmass.com/physics/optics/physical-optics-interference-40773

#### Solution Preview

Hi. Can someone please show me how to do the following problem? The answers (according to the back of the book) are (a) 690 Hz and (b) 2100 Hz, but I can't figure out how they arrive at these answers. I can't figure out where L1 and L2 are (for the L2 - L1 equation). Thank you.

Moe, Larry, and Curly sit in a line with a spacing of 1.00 m. Larry is d1 = 3.0 m in front of a pair of stereo speakers d2 = 0.800 m apart, as shown in Figure 28-33. The speakers produce a ...

#### Solution Summary

This solution is provided in 242 words in an attached document. A diagram is used to enhance understanding of the problem, and pythagorus is used to calculate distance and therefore frequency.

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