Physics, 05.05.2021 17:00 alexkrol10
1. Indoor pests such as mice and other rodents are sensitive to ultrasonic sound waves
(sound waves above the human range of frequency detection). Some companies have
produced (allegedly) rodent repellant devices that emit ultrasonic waves with
frequencies of approximately 45 kHz (1 kHz = 1000 Hz). Assuming a speed of sound of
344 m/s, determine the wavelength of these sounds waves.
Answers: 3
Physics, 21.06.2019 17:10
What is the radius of the circular path ofa charged particle in a magnetic field?
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Physics, 21.06.2019 18:10
How does the space charge width change with forward and reverse bias? also, calculate the space charge width for a reverse bias of 4v on a silicon pn junction at t = 300k and doping concentrations of na = 5x1015cm-3 , nd = 5x 1016 cm-3 .
Answers: 3
1. Indoor pests such as mice and other rodents are sensitive to ultrasonic sound waves
(sound wav...
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