x M lecture notes CH17-Intie4e x Crosn S: An Orchestre Cant x+ https/usp32nj.the

Question

x M lecture notes CH17-Intie4e x Crosn S: An Orchestre Cant x+ https/usp32nj.theexpertta Details.aspx Due Date: 9/20/2018 6:30-00 PM End Date: 12/24/2018 11:59.00 PM ch17 ex1 Begin Date: 9/18/2018 7:45.00 PM-D Problem 1: An orchestra contains both string and wind instruments. The orchestra tunes their instruments in the morning at a temperature of Tc 15 C. As they pla As usual, the speed of sound in air y, the temperamure rises in the afternoom to Ty 30 "C and falls in the late evening back to To- with increasing temperature Part (a) How has the increase in temperature from the morming to the afternoon altered the speed of sound in 1) The temperature increase has not changed the speed, wavelength, or frequency of the sound. 2) The temperature increase has not altered the speed of sound in air; it's only decreased the frequency of the sound. 3) The temperature increase has not altered the speed of sound in air; it's only increased the frequency of the sound. 4) The temperature increase has increased the speed of sound in air 5) The temperature increase has not altered the speed of sound in air, it's only decreased the wavelength of the sound 6) The temperature 7) The temperature increase has decreased the speed of sound in the air increase has not altered the speed of sound in air, it's only increased the wavelength of the sound. Part (b) How has the increase in temperature changed the frequency of the standing waves on the strings of the MultipleChoice: l) The frequency has increased because the tension in the strings has increased 2 The fequency hs increased because the density of thesouding ar has increased. 4) The frequency has decreased because the density of the surrounding air has decreased 6) There is not enough information. Part (c) To retune their stringed instruments to the orchestra players must: MultipleChoice 2 Class 5-mem... pptx class 6 conse... docxclass 6 conse... .docx MacBook Air

Explanation / Answer

1. Tc = 15 C

Th = 30 C

a. speed of sound in air, v = sqrt(gamma*RT/M)

increeasing T iuncreases speed of sound in air

option 4)

b. for strings

v = sqrt(T/mu)

now, mu remains same for increase in T ( mass per unit length)

T (tension) decreases with increase intemerature ( as strings become lose when heated)

hence v decreases with increase in T

hence v = lambda*f

lambda is same, f is decreased

5) the f has decreased as T has decreased

c. to retune stringed instruments

T has to increase

hence the strings have to be made tiughter

option 5)

d. form wind instruments

lambda remains same

f*lambda = v

v increases with increase in T

f increases as well

option 5)

e. to retune wind instruments

lambda has to be increased

option 4 ) increase length

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