Davies spi Physical principles questions with complete solutions

The mass you are imaging has a diameter of 35MM. The value can also be expressed as: A. 350 cm B. 0.35 cm C. 3.5 cm D. 35 m E. 3.5 CORRECT ANSWERS: C. 3.5 cm Relative measurement based on a logarithmic scale is expressed in: A. Newtons per centimeter squared B. Watts per centimeter squared C. dB D. Pa C. Neper CORRECT ANSWERS: C. dB Which prefix equals 10^-3 A. Micro B. Milli C. Mega D. Centi E. None of the above CORRECT ANSWERS: B. Milli When you change the transmit frequency, which of the following is altered? A. Displacement amplitude of the particles in the medium B. Speed at which the sound waves propagate through the medium C. Number of cycles per second D. Pulse is transmitted per second E. Number of an electrical impulses applied to the transducer per second CORRECT ANSWERS: C. Number of cycles per second While performing a Doppler ultrasound examination, you adjust pulse repetition frequency to 12 kHz this can also be expressed as: A. 0.12 B. 1200 hz C. 1.2 MHz D. 12,000 hz E. 120 MHz CORRECT ANSWERS: D. 12,000 hz In soundwave propagation, a region of elevated pressure is termed: A. Compression B. Demodulation C. Rarefaction D: period E. Resonance CORRECT ANSWERS: A. Compression When you switch a 2.5 MHz to a 5 MHz transducer, the wa