versa 12- Find distance that results in min sound intensity 2 Speakers are in phase and both have Frequency of 625 Hz

2. Calculate the fraction of reflected ultrasound energy when ultrasound waves cross from soft tissue into fat if the acoustic impedance for soft tissue is 1.60 x 106 kg m² s¹ and for fat has the value 1.40 x 106 kg m-² s-¹.

4. What would be the intensity level of a 44-decibel sound after being amplified 10 million times? dB

11.  A closed-end pipe produces both the third and fifth harmonics with frequencies of1100 Hz and 1833 Hz respectively. a) Calculate the frequency of the first harmonic. b) If the air temperature is 20°C where speed of sound is 334 ms-1, determine thelength of the pipe.

6. What is the lowest frequency (excluding the fundamental) at which standing wave can occur in a 0.80-m long pipe with both ends open. The speed of sound in air is 341 m/s. Hz

8. What is the beat frequency heard when two organ pipes, each open at both ends, are sounded together at their fundamental frequencies if one pipe is 60 cm long and the other is 63 cm long?(The speed of sound is 340 m/s) Hz 60 ss 60 ssfo f60 ssfs*6 09JSS

The sound intensity 50m away from the tsunami warning siren and the integrated coastal zone risk management is 0.10 W/m2 - What is the sound intensity at 1 km? What is the sound intensity level at the same distance?- The lowest intensity that is likely to be heard above the noise background is 1 µW/m2 Calculate the maximum distance at which the siren will be heard.

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