Calculate the percent error made over one mile of distance by the "5 second rule" for estimating the distance from a lightning strike if the temperature is (a) 30 C and (b) 10 C
A cassette player is said to have a signal to noise ratio of 58 dB whereas for a CD player it is 95 dB. What is the ratio of intensities of the signal and the background noise for each device?
A tight guitar string has a frequency of 540 Hz as its third harmonic. What will be its fundamental frequency if it is fingered at a length of only 60% of its original length?
(a) At T = 20 C, how long must an open organ pipe be to have a fundamental frequency of 294 Hz? (b) If this pipe is filled with helium, what is its fundamental frequency?