Question 1 (1 point) A noise has an intensity of 2.5x10-8 W/m2. If the threshold of human hearing is lo = 1.0x10-12 W/m2, calculate the sound intensity level in dB. Use two digits of precision for your answer. Your Answer: Answer Question 2 (1 point) A sound registers (8.00x10^1) decibels on a detector. What is the intensity in W/m? Assume the threshold of human hearing is 1.0x10-12 W/m2. Use three significant figures for your answer. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer Question 3 (1 point) You hear a noise with an intensity of 4.4 x 10-4 Watts/m2. Calculate the intensity in decibels. Use two digits of precision for your answer. Your Answer:An observer in a car moving at 13.7 m/s is receding from a stationary sound source which is sounding a 136 Hz note. If the speed of sound is 322 m/s, what frequency in Hz does the observer in the car hear? Use two digits of precision in your answer. Vo COON Your Answer: Answer Question 5 (1 point) A train travelling at 20.13 m/s is receding from a stationary observer, and sounding a warning horn at 277.4 Hz. If the speed of sound is 327.0 m/s, calculate the frequency which the observer hears, in Hz with two digits of precision. VS Your Answer: Answer Question 6 (1 point) A train travelling at 14.12 m/s is approaching a stationary observer, and sounding a warning horn at 507.8 Hz. If the speed of sound is 322.8 m/s, calculate the frequency which the observer hears, in Hz with two digits of precision. VS Your Answer:The first harmonic of a series created by a standing air wave in a tube open at both ends is 82.8 Hz. If the length of the tube is 210.5 cm. calculate the speed of sound of the air. Give your answer in m/s with two digits of precision. Your Answer: :] Answer Question 8 {1 point) If a sound has a frequency of 265.0 Hz and a wavelength of1.32 m, how much time does it take to travel 5,812 metres? Give your answer in seconds, with a single digit of precision. Your Answer: :] Answer Question 9 {1 point) If the frequency of a particular sound is 460.9 Hz. and the speed of sound is 332.8 m/s, what is the wavelength of the sound wave? Give your answer in metres, with two digits of precision. Your Answer: :] Answer Question 10 {1 point) If the speed of sound is 305.4 me and the wavelength of the sound is 2.55 cm, what is the frequency in kHz? Give your answer with two digits of precision. Vrun- n rrrrrrr