Part B - Dolphin clicks. One type of sound that dolphins emit is a sharp click o
ID: 1418973 • Letter: P
Question
Part B - Dolphin clicks. One type of sound that dolphins emit is a sharp click of wavelength 1.50 cm in the ocean. What is the frequency of such clicks?
Part C - Dog whistles.
One brand of dog whistles claims a frequency of 25.0 kHz for its product. What is the wavelength of this sound?
Part D - Bats.
While bats emit a wide variety of sounds, one type emits pulses of sound having a frequency between 39.0 kHz and 78.0 kHz . What is the range of wavelengths of this sound?
Part E - Sonograms.
Ultrasound is used to view the interior of the body, much as x rays are utilized. For sharp imagery, the wavelength of the sound should be around one-fourth (or less) the size of the objects to be viewed. Approximately what frequency of sound is needed to produce a clear image of a tumor that is 1.00 mm across if the speed of sound in the tissue is 1550 m/s ?
Please show all the steps required to solve the problem.
Explanation / Answer
(B) f = v/
where f = frequency and v = speed of sound and = wavelength
= 1531/1.5*10-2 = 102.07 K Hz
(C) = v / f
=343/25*103 = 1.372 cm
(D) 1 = v / f
= 343/39*103 = 0.88 cm
2 = v / f
= 343/78*103 = 0.44 cm
(E) = 1/4= 0.25*10^-3
f=v/ = 1550 / 0.25*10^-3 = 6200*10^3 = 6.2[MHz]