[填空题]
The frequency, f, in hertzoj/u);e3rklb b q0dp6 (Hz), and the period, p)ti nu3roi;1 T, in seconds, of a wave are related ;1nu3)ripiot by the equation
f=$\frac{1}{T}$An electronic signal is sent out with amplitude3 and frequency 200 Hz. The strength of this signal at time t seconds is given by $S_1$=3sin(bt)
1.Find the value of b, giving your answer in terms of $π$. $π$
A second signal of equal strength is sent out with a time delay of 2 milliseconds. The strength of the second signal at time t seconds is given by
$S_2$=3sin(b(t−c))
2.Write down the value of c. seconds
The strength of the sum of the two signals at time t seconds is given by
$S_3$=3sin(bt)+3sin(b(t−c))
3.Draw the graphs of $S_1$, $S_2$ and $S_3$ versus t, for 0≤t≤0.01, on the same axes.
