what is the the answer? 100 100 100 100 50 Print E calculator Penodic Table Ques

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what is the the answer?

100 100 100 100 50 Print E calculator Penodic Table Question 4 of 16 CA Sapling Learning macmillan leamng Bats rely on sound localization to be able to fly during the night. On a cool 20 ec summer night, a bat produces an ultrasonic sound with a frequency of 37 kHz What is the wavelength of this ultrasound, in meters? Number While remaining stationary, the bat emits a sound pulse and receives an echo after 0.250 s. How far away, in meters, is the reflecting object from the bat? Number Map

Explanation / Answer

here,

speed of ulttrasonic sound , v = 343 m/s

frequency , f = 37 KHz = 37000 Hz

a)

the wavelength , lamda = v/f

lamda = 343/37000 = 9.27 * 10^-3 m

b)

t = 0.25 s

let the distance of reflecting object be x

2 * x /t = v

2 * x /0.25 = 343

x = 42.9 m

the distance of the object is 42.9 m

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