an acoustic sensor while his son is playing the piano. His son played the piano keys from low do (261.6 Hz) to high do (523.2 Hz) consecutively for 10 seconds, and Dr. Lee collected the sound at a sampling frequency of 1000 Hz for 10 seconds. One frequency signal will be aliased. Calculate the frequency of the reconstructed signal, which is different from the original frequency. If you think there exist multiple aliased frequency signals, write all. Answer up to 1 decimal place (e. g., 0.1), and put the right unit. If necessary, round off.

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc