Chapter 3 Flashcards
What is the period of the earth’s rotation around the sun?
1 year
A top is spinning on a table. What is the period of the spinning top?
0.05 seconds
Which of the following waves is infrasonic?
2 Hz
Identify the wave that is ultrasonic.
4 MHz
Which of these waves is ultrasonic and most useful in diagnostic sonography?
4 MHz
Identify all the waves that are inaudible. 4 MHz 400 kHz 28 Hz 2 Hz
4 MHz
400 kHz
2 Hz
Which of the following waves has the longest period?
6 Hz
Of the four waves whose periods are listed below, which has the highest frequency? 8s 80us 8Ms 800ks
80 us
Of the four waves whose frequencies are listed below, which has the shortest period? 12 kHz 6000 Hz 205 Hz 1 kHz
12 kHz
Of the four waves whose periods are listed below, which has the lowest frequency? 8s 80us 8Ms 800ks
8 Ms
What are the units of wavelength, frequency, intensity, propagation speed, period, and power?
wavelength: millimeters
frequency: hertz
intensity: watts/cm squared
propagation speed: meters/second
period: second
power: watts
Does the medium or sound source determine these parameters: wavelength, frequency, intensity, propagation speed, period, power, and amplitude?
wavelength: Both
frequency: sound source
intensity: sound source
propagation speed: medium
period: sound source
power: sound source
amplitude: sound source
Using a particular ultrasound system and transducer, which of the following cannot be changed by the operator?
wavelength: cannot
frequency: cannot
intensity: can
propagation speed: cannot
period: cannot
power: can
amplitude: can
T or F. A wave with a frequency of 15,000 MHz us ultrasonic.
True
T or F. If the amplitude of a wave is increased to 3 times its original value, the intensity is increased by 6 times.
False
