10. Loudspeakers A and B are vibrating in phase and are playing the same tone, which has a frequency of 260 Hz. The distance between the speakers and the distance between speaker B and point C have the same value (d). The speed o sound is 339 m/s. What is the smallest value of (d), such that constructive interference occurs at point C? kpl kp136 skp136 skp136 sk skp136 skpi 90 36 skp136 skp/ 6 ski136 skp136 skp 6 skp136 skpl36 skp136 skp136 skp136 136 skp136 skp136 skp136 skp136 skr Vo skp136 skp136 skp136 skp136

Two students are standing the same distance from a source of sound. The first student receives a power of 68 × 10-6 W in their eardrum. The second student receives σ = 1.2 times more power in their eardrum. What is the ratio of the diameters of the students eardrums?  d1/d2= If the second students eardrums have a diameter of d=1cm what was the intensity of the sound that the student heard in watts per square meter?  I=

A row of seats is parallel to a stage at a distance of 8.4 m from it. At the center and front of the stage is a diffraction horn loudspeaker. This speaker sends out its sound through an opening that is like a small doorway with a width D of 0.074 m. The speaker is playing a tone that has a frequency of 2.00 104 Hz. The speed of sound is 343 m/s. What is the distance between two seats, located near the center of the row, at which the tone cannot be heard?

The sound pressure level at 250 Hz is 50 dB in one room and in 30 dB in the other. The surface area of the wall between them is 15 m2. The total amount of absorption at 250 Hz in the room with the lower noise level is 20 Sabines. What is the sound reduction index of the separating partition at 250 Hz:a. 20.0 dBb. 17.5 dBc. 18.8 dBd. 44.8 dB

A 3.49 rad/s (33- rpm) record has a 6.00-kHz tone cut in the groove. If the groove is located 0.100 m from the center of the record (see drawing), what is the "wavelength" in the groove? Number i 58.16 Units m One wavelength 0.100 m

2. Emma needs to know the fundamental frequency of a guitar string. She sounds the string together with an 840Hz tuning fork, and counts 15 beats in 5.0s. She then sounds the string with an 835Hz tuning fork and counts 2 beats every second. What is the frequency of the string?

2. Two boys are whispering in the library. The radiated sound power from one boy's mouth is 1.2 × 10-9 W and it spreads out uniformly in all directions. What is the minimum distance the boys must be away from the librarian so that she will not be able to hear them? The threshold of hearing for the librarian is 1.00 x 10-12 W/m².

An audio system is emitting a sound at a frequency of 676 Hz through two speakers separated by a distance d = 0.620 m. What's the shortest distance for a person to hear maximum intensity if he was facing the speaker on the right (see picture).

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