Exam (elaborations)
Medical Physics MCQS Questions With Complete Solutions
- Course
- Institution
Medical Physics MCQS Questions With Complete Solutions
[Show more]
Content preview
Medical Physics MCQS Questions WithComplete Solutions
Sound Amplification in the outer ear is (auditory canal) is affected by correct answer: Sound Pressure
Prolonged exposure to loud noise can cause permanent damage to? correct answer: Inner ear
The loss of elasticity (stiffening) of the tympanic membrane will
result in correct answer: Decrease of hearing threshold
Sound intensity level (dB) and Loudness (Phones) will have the same magnitude at the following frequency correct answer: 1000 Hz
Equal Loudness curve:
At frequency of 4000 Hz the perceived sound is correct answer: Louder than at 1000 Hz
Sound intensity level is proportional to the logarithm of the ratio
of incoming to threshold intensity SIL= 10. LOG (I/I0) If intensity is increased by a factor of 100, what is change in SIL correct answer: Increase with 20 dB (plus 20dB)
The sound intensity level in a room is 20dB. A TV produces additional intensity level of 60 dB. What is the sound intensity in the room now? correct answer: 60dB Match the physical (objective) with the corresponding psychophysical (subjective) properties of the sound
Frequency ........ Intensity .......
Acoustic Spectrum ......... correct answer: Frequency - Timbre Intensity - Pitch Acoustic Spectrum - Loudness
Sound Frequency is correct answer: Physical property (objective)
The fundamental harmonic (frequency f0) in a complex sound is
characterised by correct answer: The lowest frequency and highest amplitude
The speed of sound is calculated by the Newton - Laplace formula c = k/p (square rooted) where K is the stiffness coefficient, and p is the density of the material. If the density of the substance doubles, the speed of propagating sound wave will
correct answer: Decrease
What is the speed of sound in air correct answer: 330m/s
Does absorption of sound and the corresponding penetration depth depend on the wavelength? correct answer: It does. There
is less absorption at longer wavelengths, and they propagate deeper
Is it possible for internal organise to generate sounds that propagate to the skin and are audible? correct answer: Yes, Organs produce sounds that propagate through the tissues and are audible at the skin
Noise can be defined as correct answer: Superposition of random sound vibrations, with frequency and amplitude constantly changing in time
Damping oscillations are correct answer: oscillations with decreasing amplitude
If the amplitude of a wave doubles (x2), what would happen to the period? correct answer: There will be no change
In which of the following mediums, sound waves cannot propagate? correct answer: Vacuum
Which of the following waves are not mechanical? correct answer: Light
A propagating sound wave transfers correct answer: Energy
Which of the following factors has the most significant effect on
the speed of propagation of sound waves? correct answer: Elastic properties of the medium
Sound waves are correct answer: mechanical waves
The speed of sound ( in non dispersive medium) correct answer: Depends on the properties of the propagating medium Human ear is most sensitive to frequencies ( refer to equal loudness curve) correct answer: From 2000 Hz to 5000Hz
What is meaning of 0dB correct answer: The sound is at threshold reference level
Timbre is correct answer: Psychophysical (subjective) sound property
The pitch of sound depends mostly on correct answer: Sound frequency
Which of the following does not have relevance to the reflection/transmission of sound waves? correct answer: The colours of substances near the boundary area
Timbre is related to correct answer: Harmonic overtones
Weber-fechner law (in psychophysics) describes a logarithmic relationship between the intensity of a sound wave and ......? correct answer: The perception of loudness
Intensity is defined as? correct answer: Power per area
When sound wave travels across two materials with similar acoustic impedance, at the boundary surface will be correct answer: more transmission and less reflection
The acoustic impedance Z of a substance is defined as the product of correct answer: The density and the speed of sound: pv
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Classroom. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now