g 3. Doppler Shift (easy). As you sit out on the grass enjoying a sunny day, someone else in the park is flying a very annoying drone that is emitting sound at 600 Hz. The drone flies over head with a velocity of 30 m/s. What frequency do you hear as the drone approaches? What frequency do you hear after it has passed and is moving away from you?

Question

Physics

Dominique Randolph

10 November, 20:30

g 3. Doppler Shift (easy). As you sit out on the grass enjoying a sunny day, someone else in the park is flying a very annoying drone that is emitting sound at 600 Hz. The drone flies over head with a velocity of 30 m/s. What frequency do you hear as the drone approaches? What frequency do you hear after it has passed and is moving away from you?

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Answers (1)

Know the Answer?

Jaylah Leblanc · Answer 1

Frequency when drone approaches = 657.50 Hz (Approx)

Frequency when drone passed = 551.74 Hz (Approx)

Explanation:

Given:

Frequency = 600 Hz

Velocity before (v₁) = 30 m/s

Velocity after (v₂) = - 30 m/s

Find:

Frequency when drone approaches = ?

Frequency when drone passed = ?

Computation:

We, know that speed of sound (V) = 343 m/s

Frequency when drone approaches = [V / (V-v₁) ]Frequency

Frequency when drone approaches = [343 / (343-30) ]600

Frequency when drone approaches = [343 / (313) ]600

Frequency when drone approaches = 657.50 Hz (Approx)

Frequency when drone passed = [V / (V-v₂) ]Frequency

Frequency when drone passed = [343 / (343 - (-30)) ]600

Frequency when drone passed = 551.74 Hz (Approx)