(i) Clouds appear white. (ii) Sky appears blue.
(i) Name the system which enables us to locate
underwater objects by transmitting ultrasonic
waves and detecting the reflecting impulse. [3]
(ii) What are acoustically measurable quantities
related to pitch and loudness ?
(i) When a tuning fork [vibrating] is held close
to ear, one hears a faint hum. The same (vibrating
tuning fork] is held such that its stem is in contact
zuith the table surface then one hears a loud sound