The auditory canal of the human ear extends about 2.5 cm from the outer ear to the eardrum. a) Explain why the human ear is especially sensitive to sounds with frequencies close to 3500 Hz. Use v = 344m / s. b) Would you expect the ear to be especially sensitive to frequencies near 7000 Hz? At 10,500 Hz? Why?

The auditory canal of the human ear extends about 2.5 cm from the outer ear to the eardrum. a) Explain why the human ear is especially sensitive to sounds with frequencies close to 3500 Hz. Use v = 344m / s. b) Would you expect the ear to be especially sensitive to frequencies near 7000 Hz? At 10,500 Hz? Why?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 103AP: Radar is used to determine distances to various objects by measuring the round-trip time for an echo...

See similar textbooks

Similar questions

Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object, (a) How far away is the planet Venus if the echo time is 1000 s? (b) What is the echo time for a car 75.0 m from a highway police radar unit? (c) How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m?
(a) Find the size of the smallest detail observable in human tissue with 20.0-MHz ultrasound. (b) Is its effective penetration depth great enough to examine the entire eye (about 3.00 cm is needed)? (c) What is the wavelength of such ultrasound in 0°C air?
Sound waves entering human ear first pass through the auditory canal before reaching the eardrum. If a typical adult has an auditory canal of 2.5cm long and 7.0mm in diameter, suppose that when you listen to ordinary conversation, the intensity of sound waves is about 3.2 × 10^−6W/m^2; a) What is the average power delivered to the eardrum?
The speed of sound in air at room temperature is 343 m/s. What is the frequency of a sound wave in air with wavelength 1.71 m (in Hz)? What is the frequency of a radio wave with wavelength 1.71 m? (Radio waves are electromagnetic waves that travel at 3.00 × 108 m/s in air or in vacuum.)
Sound waves travel at roughly 340 m/s at room temperature. The minimum hearing range of a human is 20Hz. a) What is the wavelength of this wave? b) Could this wavelength fit inside the dimensions of Room 411( room dimensions are roughly 11.5 m x 8.7 m)? Justify your answer with sound reasoning
1. A 50-cd point light source is 3.0 inches above the desk. What is the surface lighting on the desk? 2. Consider the situation where an employee spent time in a number of different areas of the plant where he was exposed to a variety of noise levels as shown in the following. Determine his noise dose. Us ehwole number and answer completely. EXPOSURE NOISE LEVEL (dBA) 0.5 100 1 95 2 90 4.5 80
AM radio signals are broadcast at frequencies between 550 kHz (kilohertz) and 1600 kHz and travel at 3 x 10^8 m/s. a) What is the range of wavelengths for those signals? b) FM frequencies range between 88 MHz (megahertz) and 108 MHz and travel at the the same speed. What is the range of the FM frequencies.
AM radio signals are broadcast at frequencies between 550 kHz (kilohertz) and 1600 kHz and travel at 3 x 10^8 m/s. a) What is the range of wavelengths for those signals? b) FM frequencies range between 88 MHz (megahertz) and 108 MHz and travel at the same speed. What is the wavelength range of the FM frequencies.
The frequency range for AM radio is 540 to 1600 kHz. The frequency range for FM radio is 88.0 to 108 MHz. Part (a) Caculate the maximum AND minimum wavelength for AM radio in meters. Part (b) Caculate the maximum AND minimum wavelength for FM radio in meters.
The initials “AM” stand for amplitude modulation. Instead of fluctuating frequencies as above, they instead vary the amplitude, such that y= A(t)sin[2pif]t. Notice that the frequency is now fixed, but the amplitude will be inconsistent. Each AM station is assigned a frequency in kHz (1000 waves/second.) For example, 760AM is assigned a frequency of f=760kHz. a. What is the wavelength of the 760AM radio waves? b. Suppose a station has equation y=A(t)sin(1,850,000pit). What is this station?c. Sketch a graph of y=2^tsin(t) and explain graphically what the amplitude is doing.
Find the expression for the sinusoid shown in Figure 6. Choices: A. i= 10 sin(377t + 144°) mA B. i= 10 sin(377t + 234°) mA C. i= 10 sin(377t + 154°) mA D. i= 10 cos(377t + 234°) mA E.NOTA
a French submarine and a U.S. submarine move toward each other during maneuvers in motionless water in the North Atlantic. The French sub moves at speed vF = 50.00 km/h, and the U.S. sub at vUS = 70.00 km/h. The French sub sends out a sonar signal (sound wave in water) at 1.000 * 10^3 Hz. Sonar waves travel at 5470 km/h. (a) What is the signal’s frequency as detected by the U.S. sub? (b) What frequency is detected by the French sub in the signal reflected back to it by the U.S. sub?