Problem 3: The human ear can detect a minimum intensity of Io = 10-12 W/m2, which has a sound intensity of 0 dB. Randomized Variables β = 45 dB If the student hears a sound at 45 dB, what is the intensity of the sound? Numeric : A numeric value is expected and not an expression. I = ______________

Problem 3: The human ear can detect a minimum intensity of Io = 10-12 W/m2, which has a sound intensity of 0 dB. Randomized Variables β = 45 dB If the student hears a sound at 45 dB, what is the intensity of the sound? Numeric : A numeric value is expected and not an expression. I = ______________

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter17: Sound

Section: Chapter Questions

Problem 60P: A sound wave traveling in air has a pressure amplitude of 0.5 Pa. What is the intensity of the wave?

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Concept explainers

Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.

Question

Problem 3: The human ear can detect a minimum intensity of I_o = 10^-12 W/m², which has a sound intensity of 0 dB.

Randomized Variables

β = 45 dB

If the student hears a sound at 45 dB, what is the intensity of the sound?
Numeric : A numeric value is expected and not an expression.
I = __________________________________________

Problem 4: A student exchanges the stock headphones (β₁ = 87 dB) for her mp3 player for a new set that is louder (β₂ = 95 dB).

If the first set produced a power of P₁ = 0.5 W how much power does the new set produce, P₂ in W?
Numeric : A numeric value is expected and not an expression.
P₂ = __________________________________________

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