Question:
If the highest frequency modulating a carrier is $5 \mathrm{kHz}$, then the number of AM broadcast stations accommodated in a $90 \mathrm{kHz}$ bandwidth are $\ldots \ldots \ldots$
Solution:
B. W. (Bandwidth $)=2 \times$ maximum frequency
at modulating signal
$=2 \times 5 \mathrm{kHz}$
$=10 \mathrm{kHz}$
$\therefore$ No of stations accommodate
$=\frac{90}{10}=9$