a sound wave has a frequency of 2KHz and wavelength 35 cm.how long it will take to travel 1.5km?
The speed of the sound wave will be
v = wavelength x frequency
or
v = λ x f
here,
λ = 35cm = 0.35m
f = 2kHz = 2000 Hz
thus,
v = 0.35 x 2000 = 700 m/s
now, time taken by it to travel 1.5km (=1500 m) will be
t = velocity / distance = 700/1500
thus,
t = 0.467 seconds