Part (a) The frequency of microwave radiation with a wavelength of 3.0 cm is .
Part (b) It takes for the signal to travel from one mountaintop to the other
The wavelength of the microwave is
Speed of microwave signal is
The distance between two mountaintops is
The frequency is defined as the number of complete waves passing in unit time.
The formula to calculate the frequency in a periodic wave is given by
Substitute 0.03 m for and for c into the above formula to calculate the frequency.
The speed is defined as the rate of change of distance with respect to time.
The formula to calculate the time taken by the signal to travel from one mountaintop to another mountaintop is given by
Substitute for d and for c into the above formula to calculate the time.
A hammer taps on the end of a 4.00-m-long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 9.00 ms . What is the speed of sound in this metal?
One way to monitor global warming is to measure the average
temperature of the ocean. Researchers are doing this by measuring the time it takes sound pulses to travel underwater over large distances. At a depth of 1000 m, where ocean temperatures hold steady near 4C, the average sound speed is 1480 m/s. It’s known from laboratory measurements that the sound speed increases 4.0 m/s for every 1.0C increase in temperature. In one experiment, where sounds generated near California are detected in the South Pacific, the sound waves travel 8000 km. If the smallest time change that can be reliably detected is 1.0 s, what is the smallest change in average temperature that can be measured?
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