Author Question: In an AC circuit, the ratio of average current to maximum current is: a. zero. c. 1.0. b. 0.707. ... (Read 27 times)

sabina · **on:** Jul 28, 2018

In an AC circuit, the ratio of average current to maximum current is:
a. zero.
c. 1.0.
b. 0.707.
d. 0.5.

Question 2

A chamber that can be filled with different gases has placed in it a source of sound that in air produces a frequency of 200 Hz and a microphone to pick up the sound for frequency analysis. First the chamber is filled with helium (speed of sound 1000 m/s at room conditions), then the helium is replaced with oxygen (speed of sound 330 m/s at room conditions), and then finally the helium is replaced with carbon dioxide (speed of sound 269 m/s at room conditions). In which gas is the highest frequency of sound found by the microphone during this experiment?
a. helium
b. oxygen
c. carbon dioxide
d. They all have the same frequency of sound.