A sound wave of frequency 3kHz and a wavelength of 45 cm. How long will it take to travel 1.8 km?

A car takes 2 hours to reach a destination by travelling at the speed of 60 km/h. How long will it take when the car travels at the speed of 80 km/h?

A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what isthe wavelength of the reflected sound the reflected sound.

A metre-long tube open at one end, with a movable piston at the other end, shows resonance with a fixed frequency source (a tuning fork of frequency 340 Hz) when the tube length is 25.5 cm or 79.3 cm. Estimate the speed of sound in air at the temperature of the experiment. The edge effects may be neglected.

A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of the transmitted sound? Speed of sound in air is 340 m s^-1 and in water 1486 m s^-1 .

A radar trnsmitter genrates waves,whose frequency is 3 xx 10^9 Hz.What is the wavelength of the waves?