Question bank: Waves: Sound Intensity

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Question 1:

Easy

Waves: Sound Intensity

Theorical Question

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Question 2:

Very Hard

Sound intensity at a point in space is defined as the sound power that crosses a surface surrounding that point, divided by the area of that surface. Consider a speaker emitting spherical sound waves with a constant power of 10W. A person is located 4 meters away from the speaker and perceives a sound intensity level of 1x10^-4 W/m^2. If the person moves away from the speaker, staying in a straight line with it, so that the new distance is twice the initial distance, determine: 1) The new sound intensity perceived by the person. 2) The corresponding sound intensity level in dB to this new sound intensity. Use base 10 logarithms for power conversion and remember that the sound intensity level (SIL) in decibels (dB) is given by SIL(dB) = 10 * log10(I/I0), where I is the sound intensity in W/m^2 and I0 is the reference intensity, which is generally considered as 1x10^-12 W/m^2 for the human hearing threshold.

Waves: Sound Intensity

Theorical Question

Contextualized Question

Question 3:

Hard

Waves: Sound Intensity

Question 4:

Easy

Sound intensity depends on frequency, amplitude, wavelength, and the medium in which it propagates. Since sounds can be produced with different frequencies, what are the main divisions in the frequency spectrum?

Waves: Sound Intensity

Contextualized Question

Question 5:

Medium

Acoustic pressure levels vary according to the medium in which sound waves propagate, as some media absorb part of the energy transmitted by the sound wave while others reflect much of the received energy. Considering that air is one of the best media for sound propagation, which of the options below best describes the factors that influence sound propagation in the air?

Waves: Sound Intensity

Contextualized Question

IARA TIP

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