You are flying in an ultralight aircraft at a speed of 39 m/s. An eagle, whose speed is 18 m/s, is flying directly toward you. Each of the given speeds is relative to the ground. The eagle emits a shrill cry whose frequency is 3400 Hz. The speed of sound is 330 m/s. What frequency do you hear?

Question

Cricket

Physics

15 September, 20:21

You are flying in an ultralight aircraft at a speed of 39 m/s. An eagle, whose speed is 18 m/s, is flying directly toward you. Each of the given speeds is relative to the ground. The eagle emits a shrill cry whose frequency is 3400 Hz. The speed of sound is 330 m/s. What frequency do you hear?

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Answers (1)

Know the Answer?

Aisha Mcclain · Answer 1

frequency we hear is 4021 Hz

Explanation:

given data

aircraft speed v1 = 39 m/s

eagle speed v2 = 18 m/s

frequency f2 = 3400 Hz

speed of sound s = 330 m/s

to find out

What frequency f1 we hear

solution

we will apply here frequency formula that is

frequency = f2 (s + v1) / (s + v2) ... 1

put here all value of f2, s, v1 and v2 in equation 1

we will take v2 is negative because it move toward us so

frequency = f2 (s + v1) / (s + v2)

frequency = 3400 (330 + 39) / (330 - 18)

frequency = 3400 (369) / (312)

frequency = 4021.15

so frequency we hear is 4021 Hz