Physics Doppler Exam Questions and Answers Already Passed

Physics Doppler Exam Questions and Answers Already Passed Doppler Effect - Answers An apparant change in frequency as a result of a change in wavelength caused by motion relative to observer Proportional - Answers What is the relationship between doppler shifted frequency and velocity? Doppler Shift - Answers Difference in frequency between the frequency that was transmitted and frequency that was received. Detected frequency is lower than transmitted frequency - Answers What results in a negative doppler shift? Detected frequency is higher than transmitted frequency - Answers What results in a positive doppler shift? 1-10kHz or 20-20,000 Hz - Answers What is the normal range of doppler shift? Proportional - Answers What is the relationship between doppler shifted frequency and transmitted(operating) frequency? Inversely proportional - Answers What is the relationship between doppler shifted frequency and propagation velocity? Fdop= 2fovcos/c - Answers What is the Doppler Equation? CW, PW, Color Doppler - Answers What are the 3 standard doppler modalities? Spontaneous contrast - Answers Increase reflectivity results in ability to visualize blood 0 degrees; shift - Answers Blood flow is directed towards transducer. What is the angle and doppler shift? 180 degrees; shift - Answers Blood flow is directly away from the transducer. What is the angle and doppler shift? shift - Answers The angle formed between the flow direction and the steered doppler line is 30 degrees and traveling closer towards transducer. What is the doppler shift? shift - Answers The angle formed between the flow direction and the steered doppler line is 150 degrees and traveling away from transducer. What is the doppler shift? 90 degrees - Answers What angle results in no doppler shift? Specular reflectors - Answers This causes extremely high amplitude signals, but low doppler frequency Wider - Answers In wall filer effect, the higher the filter # the _____ black band. 25-50 Hz - Answers Typical wall filter setting for venous flow. 50-100 Hz - Answers Typical wall filter setting for arterial flow. Saturation - Answers When the clutter signals are not adequately reduced by the wall filters, this occurs. X: time Y: frequency shift (velocity) Imaginary: amplitude (brightness) - Answers What are the 3 axes to a spectral doppler presentation? X, Y, Imaginary?