What is the intensity of sound from a band with a sound level of 123 dB?(I_0 = 1

Question

What is the intensity of sound from a band with a sound level of 123 dB?(I_0 = 10^-12 W/m^2 a. 2.0 w/m^2 b. 123 W/m^2 c 1.23 W/m^2 d. 12.3 W/m^2 e. 20 W/m^2 The intensity level of sound 18 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.) a. 232 m b. 120 m c. 13 m d. 360 m e. 8 m A 520-Hz whistle is moved toward a listener at a speed of 50 m/s. At the same time, the listener moves at a speed of 70 m/s in a direction away from the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.) a. 484 Hz b. 444 Hz c. 360 Hz d. 610 Hz e. 735 Hz

Explanation / Answer

here,

10)

I0 = 10^-12 W/m^2

let the intensity of light be I

dB = 123 dB

dB = 10 * log(I/I0)

123 = 10 * log(I/(1 * 10^-12))

solving for I

I = 2 W/m^2

the intensity of light is 2 W/m^2

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