Ultrasound Physics and Applications Quiz
50 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the relationship between ultrasonic frequency and penetration depth?

  • Higher frequency leads to increased penetration
  • Frequency has no effect on penetration depth
  • Higher frequency leads to decreased penetration (correct)
  • Only low frequencies penetrate deeper

    • How does ultrasound intensity change as it penetrates deeper into tissue?

  • Intensity decreases 2 times (correct)
  • Intensity increases exponentially
  • Intensity decreases at a rate of 2.5 times
  • Intensity decreases linearly

    • Which of the following is NOT a known interaction of ultrasound with biological tissue?

  • Causes heat effect
  • Causes chemical effect
  • Causes photonic emission (correct)
  • Causes cavitation

    • Which biological effect of ultrasound is characterized by structural and physiological changes over time?

    <p>Long-term effect with structural changes</p> Signup and view all the answers

    Which effect of ultrasound is primarily associated with changes at the cellular level?

    <p>Microvibration in the cells</p> Signup and view all the answers

    Which ultrasound method is primarily used for evaluating heart conditions?

    <p>Echocardiography</p> Signup and view all the answers

    Which of the following factors can significantly impact the biological effects of ultrasound?

    <p>Frequency of the ultrasound</p> Signup and view all the answers

    What are some of the therapeutic uses of ultrasound?

    <p>Pain relief</p> Signup and view all the answers

    How can the intensity of ultrasound affect its application?

    <p>High-intensity ultrasound can cause tissue heating.</p> Signup and view all the answers

    Which of the following is NOT a common application of ultrasound?

    <p>Structural MRI of the spine</p> Signup and view all the answers

    What is the optimal audio frequency range for human hearing?

    <p>2500 Hz - 3000 Hz</p> Signup and view all the answers

    Which frequency range defines the limits of human hearing?

    <p>16 Hz - 20000 Hz</p> Signup and view all the answers

    Which categorization does not belong to the types of sound perceived by humans?

    <p>Radio waves</p> Signup and view all the answers

    Which equation correctly represents sound attenuation?

    <p>$1 = I_0 ext{ exp}(-λ_1)$</p> Signup and view all the answers

    Which of the following does not correctly represent a type of sound detected by the human ear?

    <p>Ultrasound</p> Signup and view all the answers

    Which of the following methods utilizes medical sound waves for diagnostic purposes?

    <p>Auscultation method</p> Signup and view all the answers

    What are the primary effects observed when ultrasound interacts with biological tissues?

    <p>Thermal effects</p> Signup and view all the answers

    Which of the following intensity ranges correctly categorizes ultrasonic power for medical applications?

    <p>Medium intensity 1.5-3 W/cm2</p> Signup and view all the answers

    Which formula represents the transmittance coefficient of a sound wave?

    <p>r = rac{I_{oil}}{I_{тус}}</p> Signup and view all the answers

    Which method is NOT typically associated with the detection of medical sound waves?

    <p>Magnetoencephalography</p> Signup and view all the answers

    What sound intensity level corresponds to a person with healthy ears at 1KHz?

    <p>I_{0} = 10^{-12} Вт/м^{2} - I_{max} = 12Вт/м^{2}</p> Signup and view all the answers

    What can be a possible outcome of cavitation when ultrasound is applied to tissues?

    <p>Formation of gas bubbles</p> Signup and view all the answers

    Which formula accurately determines the loudness of a sound?

    <p>E_{ heta} = k imes log rac{I}{I_{0}}</p> Signup and view all the answers

    Which of the following is NOT a plausible formula for transmittance?

    <p>r = I_{oil} imes I_{тус}</p> Signup and view all the answers

    Which expression represents the loudness of sound incorrectly?

    <p>E_{ u} = k imes log rac{I^{2}}{I_{0}}</p> Signup and view all the answers

    Which of the following best describes biophysics in the context of sound interactions with biological material?

    <p>Study of how sound is absorbed, transmitted, and interacts with biological systems.</p> Signup and view all the answers

    What defines cavitation in the context of ultrasound applications?

    <p>The formation and collapse of microbubbles in a liquid due to changes in pressure.</p> Signup and view all the answers

    Which ultrasound intensity level is primarily associated with micro-vibrations occurring at the cellular level?

    <p>Low-intensity ultrasound.</p> Signup and view all the answers

    What aspect of biophysics deals with the mechanics of liquid and solid motion within fluids?

    <p>Fluid dynamics.</p> Signup and view all the answers

    In the context of ultrasounds, what method uses tapping to assess the state of internal organs?

    <p>Percussion.</p> Signup and view all the answers

    Which instrument is specifically designed to assess hearing capabilities?

    <p>Audiometer</p> Signup and view all the answers

    What is the standard frequency range typically used for audio testing in hearing assessments?

    <p>Below 20000 Hz</p> Signup and view all the answers

    Which of the following statements correctly matches ear parts with their functions?

    <p>Outer ear - Ear canal and eardrum; Middle ear - Contains ossicles; Inner ear - Converts sound to nerve impulses.</p> Signup and view all the answers

    Which structure is NOT correctly found in the inner ear?

    <p>Eardrum</p> Signup and view all the answers

    Which statements accurately describe the inner ear's functionality?

    <p>Transforms mechanical vibrations into nerve impulses using hair cells.</p> Signup and view all the answers

    Which statement about sound frequencies is accurate?

    <p>Ultra sound is effective for medical diagnostics.</p> Signup and view all the answers

    Which expression correctly represents the Weber-Fechner law?

    <p>$E_ heta = k.lg(1/1_0)$</p> Signup and view all the answers

    What is a consequence of changing the structure of biomacromolecules?

    <p>Damage due to structural alteration.</p> Signup and view all the answers

    Which statement regarding the impact of sound on human hearing is incorrect?

    <p>Sounds below 16 Hz are classified as audible.</p> Signup and view all the answers

    Which of the following is an accurate statement about sound waves?

    <p>Continuous sound is easily identified from random noise.</p> Signup and view all the answers

    What is the average acoustic impedance of the human body in terms of Rayls?

    <p>1,380,000 - 1,700,000</p> Signup and view all the answers

    At what sound pressure level does sound transmit to the inner ear from the middle ear?

    <p>56 dB</p> Signup and view all the answers

    Which law is utilized when adjusting the perception of loudness and softness of sound?

    <p>Weber-Fechner psychophysics (loud-quiet)</p> Signup and view all the answers

    What term describes the phenomenon where ultrasonic waves generate tiny bubbles in a liquid?

    <p>Cavitation</p> Signup and view all the answers

    Which intensity level is typically NOT associated with sound transmission to the inner ear from the middle ear?

    <p>1000 dB</p> Signup and view all the answers

    What is the technique that uses percussion to analyze the sounds of organs or tissues?

    <p>Percussion</p> Signup and view all the answers

    What is a unit that is 10 times smaller than a baseline unit in practical measurements?

    <p>Decibel</p> Signup and view all the answers

    Given a sound wave with an intensity of $I_{incident}$ = 8 $Wm^{−2}$ and reflected with an intensity of $I_{reflected}$ = 12 $Wm^{−2}$, what is the reflection coefficient?

    <p>0.6</p> Signup and view all the answers

    Calculate the intensity level of a sound wave with an intensity of 150 $Wm^{−2}$ using 10$^{-12}$ $Wm^{−2}$ as a reference level in decibels.

    <p>36.12</p> Signup and view all the answers

    What is the term for the phenomenon where sound waves are reflected back from a surface?

    <p>Reflection</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser