An echo returned in 3 s. What is the distance of reflecting surface from the source ? Given that the speed of sound is `342 ms^ -1`.

An echo is heard after 4s. What is the distance of reflecting surface from the source, given that the speed of sound is 342 ms^-1 .

What is the wavelength corresponding to a freqency of 200 Hz. Given the speed of sound in air is 344 ms^-1

What is the minimum distance of the obstacle from the source of sound for hearing distinct echo ?

A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is 1.7 km s^-1 ? The operating frequency of the scanner is 4.2 MHz.

When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day ?

A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine moves towards the SONAR with a speed of 360 km h^-1 . What is the frequency of sound reflected by the submarine ?Take the speed of sound in water to be 1450m s^-1 .