Ultrasound Physics and Technology Quiz

What is the frequency range of ultrasound waves used for medical purposes?

• 0.1-1 kHz
• 1-20 kHz
• 1-20 MHz
• 20-100 MHz

Which of the following best describes the piezoelectric effect?

• Conversion of light energy to electrical energy
• Conversion of electrical energy to mechanical energy and vice versa
• Conversion of thermal energy to mechanical energy
• Conversion of mechanical energy to nuclear energy

What is the primary function of an ultrasound transducer?

• To convert sound waves into visible light
• To transmit and detect ultrasound waves
• To amplify sound waves
• To filter out low-frequency noise

What happens when an alternating potential difference is applied to the piezoelectric material in an ultrasound transducer?

• It produces heat
• It creates a magnetic field
• It causes vibrations, producing ultrasound pulses
• It emits visible light

What does acoustic impedance measure?

• The speed of sound in a medium
• The density of a medium
• The difficulty for an acoustic wave to travel through a medium
• The frequency of sound waves in a medium

What is the formula for acoustic impedance?

• Z = ρ/c
• Z = ρc
• Z = c/ρ
• Z = ρc²

Which of the following materials has the highest acoustic impedance?

• Air
• Water
• Fat
• Bone

What is the approximate acoustic impedance of air?

• 429 kg m⁻²s⁻¹
• 1.5 × 10⁶ kg m⁻²s⁻¹
• 1.34 × 10⁶ kg m⁻²s⁻¹
• 5.7 × 10⁶ kg m⁻²s⁻¹

Where does reflection of ultrasound waves occur?

• Only within a single medium
• At the boundary between two mediums
• Only in liquids
• Only in solids

What does the intensity reflection coefficient (Iᵣ/Iᵢ) represent?

• The ratio of transmitted to incident intensity
• The ratio of reflected to incident intensity
• The total energy of the ultrasound wave
• The speed of the ultrasound wave