All of the following are true EXCEPT:
a) two waves with identical frequencies must interfere constructively.
b) constructive interference is associated with waves that are in-phase.
c) out-of-phase waves interfere destructively.
d) waves of different frequencies may exhibit both constructive an...
Edelmen's SPI Exam Review
All of the following are true EXCEPT:
a) two waves with identical frequencies must interfere constructively.
b) constructive interference is associated with waves that are in-phase.
c) out-of-phase waves interfere destructively.
d) waves of different frequencies may exhibit both constructive and destructive
interference at different times. - ✔️✔️A
Which of these intensities is the smallest?
a) SATP
b) SPTP
c) SATA - ✔️✔️C
The effects of soft tissue on ultrasound are called:
a) acoustic proliferation properties
b) dynamic effects
c) acoustic propagation properties
d) biological effects - ✔️✔️C
The speed of sound of ultrasound in soft tissue is closest to:
a) 1,540 km/sec
b) 1.54 km/sec
c) 1,500 m/s
d) 1,540 mm/sec - ✔️✔️C
Which is not an acoustic variable?
a) density
b) pressure
c) distance
d) intensity - ✔️✔️D
Put in decreasing order:
a) deca
b) deci
c) micro
d) centi - ✔️✔️abdc
______ is the time to complete one cycle
a) pulse duration
,b) pulse period
c) period
d) duration period - ✔️✔️C
Sound waves are:
a) electric
b) mechanical, transverse
c) spectral
d) longitudinal, mechanical - ✔️✔️D
Which of the following sound waves is ultrasonic and least useful in diagnostic imaging?
a) 30 KHz
b) 8 Mhz
c) 8,000 Hz
d) 3,000 Hz
e) 15 Hz - ✔️✔️A
______ is the distance covered by one cycle.
a) pulse length
b) wavelength
c) cycle distance
d) cycle duration - ✔️✔️B
Which of the following is determined by the source and the medium?
a) frequency
b) period
c) propagation speed
d) range resolution - ✔️✔️D
Propagation speed = _______ x wavelength
a) pulse duration
b) period
c) # of cycles in the pulse
d) frequency - ✔️✔️D
As a result of _____ the propagation speed increases.
a) increasing stiffness and increasing density
b) increasing stiffness and increasing elasticity
c) decreasing compressibility and decreasing density
d) decreasing stiffness and decreasing density. - ✔️✔️C
Put in decreasing order of propagation speed.
a) gas
b) liquid
c) solid - ✔️✔️c b a
, If the frequency of an ultrasound wave is doubled, what happens to the period?
a) doubles
b) halved
c) remains the same
d) 4x greater - ✔️✔️B
The units of pulse repetition frequency are:
a) per minute
b) microseconds
c) mm/microseconds
d) MHz - ✔️✔️A
The time from the beginning of the pulse to the end of that pulse is _______?
a) period
b) pulse duration
c) pulse length
d) PRF - ✔️✔️B
What happens to the speed of sound in a medium when the bulk modulus increases?
a) faster
b) slower
c) unchanged - ✔️✔️A
If the wave's amplitude is doubles, what happens to the power?
a) nothing
b) halved
c) doubled
d) quadrupled - ✔️✔️D
If the level of acoustic variable ranges from 55-105, what is the amplitude?
a) 105
b) 50
c) 25
d) 55 - ✔️✔️25
Power of sound has units of:
a) dB
b) dB/cm
c) watts
d) watts/cm^2 - ✔️✔️C
If the intensity of a sound beam remains unchanged while the beam area is reduced in
half, what has happened to the power?
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 PatrickKaylian. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.39. You're not tied to anything after your purchase.
