Ch. 3 Review ~ Describing Sound Waves

1

What are the units of measure for:

1. Wavelength = ❌
2. Frequency = ❌
3. Intensity = ❌
4. Propagation speed = ❌
5. Period = ❌
6. Power = ❌

millimeters

Hertz

Watts/cm(2)

meters/second

second

Watts

1

Does the medium or sound source determine these parameters?

1. wavelength ( Sound Source, Medium, Both )
2. frequency ( Sound Source, Medium, Both )
3. intensity (initial) ( Sound Source, Medium, Both )
4. propagation speed ( Sound Source, Medium, Both )
5. period ( Sound Source, Medium, Both )
6. power (initial) ( Sound Source, Medium, Both )
7. amplitude (initial) ( Sound Source, Medium, Both )

1

Using a particular ultrasound system and transducer, which of the following cannot be changed by the operator?

1. wavelength ( Can, Cannot )
2. frequency ( Can, Cannot )
3. intensity ( Can, Cannot )
4. propagation speed ( Can, Cannot )
5. period ( Can, Cannot )
6. power ( Can, Cannot )
7. amplitude (initial) ( Can, Cannot )

1

A wave with a frequency of 15,000 MHz is ultrasonic.

1

If the amplitude of a wave is increased to 3 times its original value, the intensity is increased by 6 times.

1

Which of the following best describes the line identified by the letter A?

1

Which of the following best describes the line identified by the letter B?

1

Which of the following best describes the line identified by the letter C?

1

Which of the lines is most likely to be the reciprocal of frequency?

1

Which of the following best describes the line identified by the letter D?

1

Which of the following best describes the line identified by the letter D?

1

Which of the lines is most likely to be determined by the source and the medium?

1

If the power of a wave is halved, the intensity is reduced to one-fourth its original value.

1

Medium 1 has a density of 9 and a stiffness of 6.
Medium 2 has a density of 8 and a stiffness of 6.
In which medium will sound travel slower?

1

Which of the following characteristics will create the fastest speed of sound?

1

Propagation speed increases as frequency increases.

1

Which of the following characteristics will create the fastest speed of sound?

1

If the power in a beam is 1 watt and the area is 5 cm(2), what is the beam's intensity?

1

If the intensity remains the same while the power is doubled, what has happened to the beam area?

1

A sound beam travels a total of 10 cm in 2 seconds. What is the speed of the sound?

1

Propagation speed increases as frequency increases.

1

Propagation speed increases as frequency decreases.

1

Propagation speed does not change as frequency increases.

1

What is the wavelength of 3 MHz sound in soft tissue?

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What is the wavelength of a wave with an unknown frequency traveling in soft tissue?

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What is the wavelength of 2 MHz sound in soft tissue?

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The effects of sound waves on tissue in the body are called .

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Which of the following are considered acoustic variables? (More than one answer could be correct)

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Which of the following are considered acoustic parameters? (More than one answer could be correct)

1

The effects of tissue on sound waves are called .

1

The effects of medium on an ultrasound wave are called

1

How are the following parameters related?

( directly related, inversely related, unrelated ) - frequency and period
( directly related, inversely related, unrelated ) - amplitude and power
( directly related, inversely related, unrelated ) - amplitude and intensity
( directly related, inversely related, unrelated ) - power and intensity
( directly related, inversely related, unrelated ) - wavelength and intensity
( directly related, inversely related, unrelated ) - wavelength and frequency
( directly related, inversely related, unrelated ) - acoustic velocity and density
( directly related, inversely related, unrelated ) - elasticity and speed of sound
( directly related, inversely related, unrelated ) - acoustic velocity and compressibility
( directly related, inversely related, unrelated ) - stiffness and sound speed
( directly related, inversely related, unrelated ) - frequency and sound speed
( directly related, inversely related, unrelated ) - frequency and intensity
( directly related, inversely related, unrelated ) - power and frequency

Describing Sound Waves

Ch. 3 Review ~ Describing Sound Waves

What are the units of measure for: 1. Wavelength = ❌ 2. Frequency = ❌ 3. Intensity = ❌ 4. Propagation speed = ❌ 5. Period = ❌ 6. Power = ❌

A wave with a frequency of 15,000 MHz is ultrasonic.

If the amplitude of a wave is increased to 3 times its original value, the intensity is increased by 6 times.

Which of the following best describes the line identified by the letter A?

Which of the following best describes the line identified by the letter B?

Which of the following best describes the line identified by the letter C?

Which of the lines is most likely to be the reciprocal of frequency?

Which of the following best describes the line identified by the letter D?

Which of the following best describes the line identified by the letter D?

Which of the lines is most likely to be determined by the source and the medium?

If the power of a wave is halved, the intensity is reduced to one-fourth its original value.

Medium 1 has a density of 9 and a stiffness of 6. Medium 2 has a density of 8 and a stiffness of 6. In which medium will sound travel slower?

Which of the following characteristics will create the fastest speed of sound?

Propagation speed increases as frequency increases.

Which of the following characteristics will create the fastest speed of sound?

If the power in a beam is 1 watt and the area is 5 cm(2), what is the beam's intensity?

If the intensity remains the same while the power is doubled, what has happened to the beam area?

A sound beam travels a total of 10 cm in 2 seconds. What is the speed of the sound?

What are the units of measure for:

1. Wavelength = ❌
2. Frequency = ❌
3. Intensity = ❌
4. Propagation speed = ❌
5. Period = ❌
6. Power = ❌

Medium 1 has a density of 9 and a stiffness of 6.
Medium 2 has a density of 8 and a stiffness of 6.
In which medium will sound travel slower?