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Laser Doppler Vibrometers Detect the Doppler Shift of a Laser

Question 191

Multiple Choice

Laser Doppler vibrometers detect the Doppler shift of a laser beam reflected off an individual's chest to measure respiratory rate.  The calculated displacement of the chest during a breath using a 500-nm laser is shown below. Laser Doppler vibrometers detect the Doppler shift of a laser beam reflected off an individual's chest to measure respiratory rate.  The calculated displacement of the chest during a breath using a 500-nm laser is shown below. If the laser source is stationary, at which point(s) would the observed frequency of the reflected laser be 6 × 10<sup>14</sup> Hz? A) II only B) I and II only C) I and III only D) II and III only If the laser source is stationary, at which point(s) would the observed frequency of the reflected laser be 6 × 1014 Hz?


A) II only
B) I and II only
C) I and III only
D) II and III only

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