A man can hear the sound of frequency :
(a) 1 Hz
(b) 1000 Hz
(c) 200 kHz
(d) 5 MHz
A man can hear sound between 20 Hz and 20,000 Hz. So, he can hear 1000 Hz frequency. Hence, the correct choice is (b).
A man X can hear only upto 10 kHz and another man Y upto 20 kHz. A note of frequency 500 Hz is produced before them from a stretched string. Then