The sound level at a distance d%=49 m from a loudspeaker is 70 dB. What is the power (in Watt) at which sound energy is being produced by the loudspeaker?. The threshold of hearing, lo 1*10-12 W/m?. A. 0.3018 B. 0.8512 C. None D. 1.207

1. The intensity sound level in air is 68dB. Calculate Pmax if the temperature is 20°C, the density of air is p = 1.20 kg/m3 and the speed of sound is v= 344 m/s.

A speaker source of the sound level of 10 dB. What is the intensity of N = 984 sound sources of the same sound level (W/m?. The intensity at the threshold of hearing, lo = 10-12 W/m2. A. 0.00000002952 B. 0.00000003936 C. None D. 0.00000000984 E. 0.00000001968

The sound level at a distance d=34 m from a loudspeaker is 70 dB. What is the power (in Watt) at which sound energy is being produced by the loudspeaker?. The threshold of hearing, lo = 1*10-12 W/m2, A. 0.5265 B. 0.3812 C. 0.1453 D. None E. 0.5812

4. A bystander hears a siren vary in frequency from 592 Hz to 380 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.) m/s @ 2 W S X command # 3 E D C $ 4 R F G Search or type URL % 5 V.. T G MacBook Pro 6 B Y H & 7 N U 00+ J 8 - M 1332 j ( 9 0 K .C O L command P V - *** : 2 t { option [ ? 12

The area of a typical eardrum is approximately 5.0 x 10°m². Calculate the sound power on the eardrum at: (Intensity = Power/Area) a. The threshold of hearing. b. The threshold of pain.

The softest sound a human ear can hear is at 0 dB (Io = 10-12 W/m2). Sounds above 130 dB cause pain. A particular student's eardrum has an area of A = 51 mm^2. a. What is the most power, in watts, the ear can receive before the listener feels pain?  b. What is the smallest power, in watts, the ear can detect?

The speed of sound in air is 340 m/s, and the density of air is 1.20 kg/m³. If the displacement amplitude of a 510.0-Hz sound wave is Pa 14.0 μm, what is its pressure-variation amplitude? i

9) It is a hot summer day. The temperature is 35 °∁ . A car is traveling at 18.846 km/hour honking it 1000Hz horn.a) What is the speed of sound at that temperature?b) The car is traveling towards you. What is the frequency you hear?c) The car is traveling away from you. What is the frequency you hear?

The sound level of an incoming diesel train is measured to be 85 dB. What is its corresponding sound intensity? A. 2.13 x 10^(-4) W/m^2. B. 2.82 x 10^(-4) W/m^2. C. 3.16 x 10^(-4) W/m^2. D. 3.57 x 10^(-4) W/m^2. E. 4.49 x 10^(-4) W/m^2.