Linear Superposition

The sound produced by a loudspeaker has a frequency of 12,000 Hz and arrives at the microphone via two different paths. The sound travels through the left tube LXM, which has a fixed length. Simultaneously, the sound travels through the right tube LYM, the length of which can be changed by moving the sliding section. At M, the sound waves coming from the two paths interfere. As the length of the path LYM is changed, the sound loudness detected by the microphone changes. When the sliding section is pulled out by 0.020 m, the loudness changes from a maximum to a minimum. Find the speed at which sound travels through the gas in the tube.

Sound waves : Calculating the distances between the points of interference.

Speakers A and B are vibrating in phase. They are directly facing each other, are 7.80 m apart, and are each playing a 73.0 Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three pointswhere constructive interference occurs. What are the distances of these three points from speaker A?

Calculating the frequency of a string.

When a guitar string is sounded along with a 440 Hz tuning fork, a beat frequency of 5Hz is heard. When the same string is sounded along with a 436 Hz tuning fork, the beat frequency is 9 Hz. What is the frequency of the string?

oscillation

the oscillation period is 1.25 seconds (just in case it's hard to read)

capacitance

1. What is capacitance? 2. How does a given capacitor's value of capacitance depend on an external potential difference of a connected source? 3. How should you connect four identical capacitors to result in an equivalent capacitance that is equal to one individual capcitance?