In Fig. 17-26, three long tubes ( A , B , and C ) are filled with different gases under different pressures. The ratio of the bulk modulus to the density is indicated for each gas in terms of a basic value B 0 / ρ 0 . Each tube has a piston at its left end that can send a sound pulse through the tube (as in Fig. 16-2). The three pulses are sent simultaneously. Rank the tubes according to the time of arrival of the pulses at the open right ends of the tubes, earliest first. Figure 17-26 Question 3.
In Fig. 17-26, three long tubes ( A , B , and C ) are filled with different gases under different pressures. The ratio of the bulk modulus to the density is indicated for each gas in terms of a basic value B 0 / ρ 0 . Each tube has a piston at its left end that can send a sound pulse through the tube (as in Fig. 16-2). The three pulses are sent simultaneously. Rank the tubes according to the time of arrival of the pulses at the open right ends of the tubes, earliest first. Figure 17-26 Question 3.
In Fig. 17-26, three long tubes (A,B, and C) are filled with different gases under different pressures. The ratio of the bulk modulus to the density is indicated for each gas in terms of a basic value B0/ρ0. Each tube has a piston at its left end that can send a sound pulse through the tube (as in Fig. 16-2). The three pulses are sent simultaneously. Rank the tubes according to the time of arrival of the pulses at the open right ends of the tubes, earliest first.
3 In Fig. 17-26, three long tubes
(A, B, and C) are filled with differ-
ent gases under different pressures.
The ratio of the bulk modulus to the
16B,/Po
density is indicated for each gas in
terms of a basic value Balpg. Each
tube has a piston at its left end
that can send a sound pulse
through the tube (as in Fig. 16-2).
The three pulses are sent simulta-
neously. Rank the tubes according
to the time of arrival of the pulses
at the open right ends of the tubes,
4B/Po
By/Po
C.
earliest first.
Figure 17-26 Question 3.
A particular person's eardrum is circular, with a diameter of 9.00 mm.
(a)How much sound energy (in J) is delivered to an eardrum in one second, at the threshold of human hearing? (The threshold of human hearing is taken to be 1.00 ✕ 10−12 W/m2.)
J
(b)How much sound energy (in J) is delivered to an eardrum in one second, at the pain threshold for human hearing? (The pain threshold occurs at 1.00 W/m2, one trillion times as intense as the lowest audible level.)
J
(c)Assume that musicians onstage are exposed to sound that is 10 decibels below the human pain threshold. Over the course of a two-hour concert, how much sound energy (in J) does each ear absorb onstage?
J
Sound is detected when a sound wave causes the tympanic membrane (the ear drum) to vibrate. Typically, the diameter of this membrane is about 8.4 mm in humans. A) how much energy is delivered to the eardrum each second when someone whispers (20 dB) into your ear? B) to comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.
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