1. What is the intensity of sound 4m away from a 500W speaker? How much energy is absorbed by the eardrum per minute if the surface area of the ear is 6X10$ m2
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- 4. What are the first three resonant lengths in a closed air column if the frequency of the tuning fork is 384HZ, and the air temperature is 22°C.5. A quantum object travels directly toward you at a constant rate while producing a sound with a singular frequency of 440 Hz. While you stand still, the object passes through you and continues Moving (you are uninjured). You measure an overall shift in the frequency you hear to be 25.0 Hz. Assume is it 20.0 °C during this shift. a) What is the speed of this particle? b) After is passes through you, you notice that your wallet is missing and see it attached to this particle. You begin accelerating toward the particle at a constant rate of 1.50 m/s² via ion propelled roller shoes. At what time do you perceive a frequency of 435 Hz? c) You stop accelerating when you perceive a frequency of 435 Hz and continue to travel at a constant rate at which time the particle then instantaneously reverses it path to return your wallet, traveling back toward you at its same constant rate which it initially had. What frequency do you then perceive at it travels toward you?The denizens of a distant planet live under an atmosphere made predominately of CO2, which is a dispersive medium. While attending a concert, which of the following would be true for a spectator seated in the back of a large amphitheatre? I. They would hear the low notes and high notes at the same time. II. They would hear the low notes and high notes at different times. III. They would hear nothing because sound can't propagate in CO2.
- 8. A "G" on a guitar has a frequency of about 196Hz. To raise the note to a "B" at 247 Hz, what length would the string have to be shortened to? Assume the original string is 1.0m long.What is the dynamic range of human ear?a. threshold of hearing (W/m2)b. threshold of pain (W/m2)c. SIL of threshold of hearing(dB)d. SIL of threshold of pain(dB)e. Sound intensity level of 200 dB54. What is the intensity in decibels of a 20 Watt speaker at 50 meters away? Intensity = Power/ Area of Sphere A. 88 dBB. 94 dBC. 98 dBD. 104 dB
- The highest frequency sound humans can hear is about 20,000 HzHz. 1. What is the wavelength of sound in air at this frequency? 2. What is the wavelength of the lowest sounds we can hear, about 20 HzHz?10. If the intensity for 5 bugs is 6 x 10-12 W/m² then what is the intensity for 1 bug? For 3 bugs? 11. If 1 bug makes a sound of 8 dB then what will 25 bugs sound like? 12. If 4 bugs make a sound of 14 dB then what will 25 bugs sound like?8. When you are 5.00 meters from a point source of sound waves you detect an intensity level, B, of 117 dB. The power output of the source is: a. What is the intensity level, ß, that you will detect if you moved to a location that is 10.0 meters from the source? Note your answer should be in dB. b. What is the power output of the source (in Watts)?
- 49. What will most likely happen to a ringing bell if placed inside a bell jar connected to a vacuum pump? A. The sound intensity will increase.B. The sound intensity will decrease.C. Frequency of the sound will decrease.D. The speed of sound will increase.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?29.) Humans can generally hear sounds with frequencies ranging from 20.0 to 20,000 Hz. This means that a. humans have no difficulty hearing sounds in this range b. humans have difficulty hearing high pitched sounds above 20,000 Hz c. humans have difficulty hearing low pitched sounds below 20.0 Hz d. all of these statements about human hearing are true