Physics Chapter 6: Interaction of Sound and Media Quiz

What does a positive decibel value indicate?

• The intensity is constant.

• The intensity is decreasing.

• The intensity is increasing.

• The intensity is zero.

What is the logarithm of 1000?

• 1

• 2

• 4

• 3

Which of the following is a primary component of attenuation?

• Reflection

• Absorption

• Diffusion

• Refraction

What is the unit of impedance?

• dB

• Hz

• Rayls

• Watts

What does a -10 dB change in intensity mean?

• The intensity has doubled.

• The intensity is one tenth of the original.

• The intensity is unchanged.

• The intensity is ten times the original.

What is the attenuation coefficient in soft tissue approximately equal to?

• Half the frequency

• The square of the frequency

• Twice the frequency

• The frequency

What is the term for the random redirection of sound in many directions?

• Reflection

• Absorption

• Refraction

• Scattering

What is the intensity reflection coefficient (IRC) when sound hits a boundary between soft tissue and bone?

• Less than 1%

• 50%

• 99%

• 100%

What is the effect of higher frequency on Rayleigh scattering?

• It decreases Rayleigh scattering.

• It has no effect on Rayleigh scattering.

• It increases Rayleigh scattering.

• It reverses Rayleigh scattering.

What is the relationship between distance and attenuation?

• They are inversely related.

• They are exponentially related.

• They are unrelated.

• They are directly related.