The distance between the two pressure sensors in a shock tubes is 150 mm. The time taken by a shock wave to travel this distance is 0.3 ms. If the velocity of second is 340 m/s under the same condition, find the march number of the shock waves.
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- A sound wave is modeled as ΔP=2.27 Pasin(50.46 m−1⋅x−17156 s−1⋅t)ΔP=2.27 Pasin(50.46 m-1⋅x-17156 s-1⋅t). What is the maximum change in pressure, the wavelength, the frequency, and the speed of the sound wave? ΔPmax=ΔPmax= Correct Pa λ=λ= Correct m f=f= Incorrect Hz v=v= Incorrect m/sSuppose you hear a clap of thunder 8.20 s after seeing the associated lightning strike. The speed of light in air is 3.00 ✕ 108 m/s. (a) How far are you from the lightning strike? (The speed of sound waves in air is 343 m/s.)As you zip through space in your PPS (personal propulsion suit), your pulse rate as you count it is 121 bpm (beats per minute). This high pulse rate serves as objective evidence of your excitement. However, an observer on the Moon, an expert in pulse rate telemetry, measures your pulse rate as slower. In fact, she detects only 0.561 times the rate you count and claims that you must be pretty calm in spite of everything that is going on. How fast are you moving with respect to the Moon?
- A bat is flying 5.10 m/s is chasing an insect flying in the same direction. The bat emits a 39.9 kHz chirp and receives back an echo at 40.6 kHz. What is the speed of the insect ?Police radar determines the speed of motor vehicles using the same Doppler-shift technique employed for ultrasound in medical diagnostics. Beats are produced by mixing the double Doppler-shifted echo with the original frequency. If 1.25 × 109 Hz microwaves are used and a beat frequency of 163 Hz is produced, what is the speed of the vehicle in m/s? (Assume the same Doppler-shift formulas are valid with the speed of sound replaced by the speed of light.)You place your ear onto a steel railroad track and hear the sound of a distant train through the rails Δt = 2.7 seconds before you do through the air. The speed of sound in steel is vs = 6100 m/s, and and the air temperature is 36° C. Find the distance, D, to the train in meters.
- The wavelength of light visible to the human eye is on the order of 6 × 10 −7 m. If the speed of light in air is 3 × 10 8 m/s, find the frequency of the lightwave.It is claimed that an oblique shock can be analyzed like a normal shock provided that the normal component of velocity (normal to the shock surface) is used in the analysis. Do you agree with this claim?Find the range of wavelengths emitted by the bat in meters, by using that the speed of sound is c=343m/sec and the range of frequencies from 70 to 30KHz. The solution matches the range of sizes for an insect. What is the order of magnitude for this range? Take this order and call it L for the average size of an insect. b) If the bat produces a power of P = 10^-5 watts and its hearing threshold is 10^-12 watts/m^2 what is the maximum distance from which the bat can detect an echo?
- A group of hikers hears an echo 3.40 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 342 m/s.)A group of hikers hears an echo 3.10 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 344 m/s.) mI need help with this question