A certain dog whistle operates at 21.1 kHz , while another (brand X) operates at an unknown frequency.
If humans can hear neither whistle when played separately, but a shrill whine of frequency 5500 Hz occurs when they are played simultaneously, estimate the operating frequency of brand X.
Operating frequency of brand X = 21.1 + 5.5 kHz
= 26.6khz
It is so because difference between two frequencies is given as 5500 Hz ( i.e. beat frequency)
A certain dog whistle operates at 21.1 kHz , while another (brand X) operates at an...