Ultrasound Physics chapter 19

What is the Doppler effect?

• The change in frequency and wavelength caused by motion of the sound source

• The change in amplitude of a wave due to the observer's position

• The change in speed of sound in different mediums

• The change in pitch of a sound due to the temperature of the environment

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What is another factor that can cause the Doppler effect besides the sound source and the receiver?

• The reflector

• The angle of incidence

• The harmonic series

• The decibel level

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What happens to the wavelength and frequency of a sound when the source or reflector moves towards the receiver?

• Wavelength increases, frequency decreases

• Wavelength decreases, frequency increases

• Wavelength and frequency both increase

• Wavelength and frequency both decrease

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What is the term used to describe the change in frequency due to motion?

• Sonic boom

• Resonance

• Doppler shift

• Frequency modulation

What happens to the frequency of a wave when an object is moving towards the receiver, causing a positive Doppler shift?

• The frequency remains the same.

• The frequency is less than transmitted.

• The frequency is greater than transmitted.

• The frequency becomes zero.

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What is observed when there is a negative Doppler shift?

• The object is stationary relative to the receiver.

• The object is moving towards the receiver.

• The object is moving away from the receiver.

• The received frequency is greater than transmitted.

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What happens to the frequency of the reflected sound when red blood cells are moving toward the transducer?

• The frequency remains the same

• The frequency becomes unpredictable

• The frequency is reflected at higher frequencies than what the transducer is producing

• The frequency is reflected at lower frequencies than what the transducer is producing

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What happens to the frequency of the reflected sound when red blood cells are moving away from the transducer?

• The frequency is reflected at higher frequencies than what the transducer is producing

• The frequency remains the same

• The frequency becomes unpredictable

• The frequency is reflected at lower frequencies than what the transducer is producing

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What is the operating frequency of a 5 MHz transducer?

• 5,000 Hz

• 500,000 Hz

• 5,000,000 Hz

• 50,000,000 Hz

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If the transducer transmits a frequency of 5,000,000 Hz and the received frequency is 5,003,000 Hz, what is the Doppler shift?

• 3,000 Hz

• 300 Hz

• 30,000 Hz

• 3 Hz

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