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Ultrasound frequency is expressed in units of 

What is the active component that produces the sound energy and image in an ultrasound transducer?

Propagation speed is determined by the _____.

Is the continuous-time signal x(t) = sin(3πt/5) periodic? If yes, what is the fundamental period?

What is the preferred ultrasound examination to evaluate vascular occlusions and blood flow dynamics?

For a LTI system with impulse response h(t) = e2t u(3-t), is the system causal?

What is the Fourier transform H2(jω) of h2(t) = e-6tu(t)? 

An input signal x[n] = u[n+2]-u[n] goes through a LTI system with impulse response h[n] = (1/3)nu[n] and generates output signal y[n]. Fill in the value for y[-1], round to two decimal places.

Which of the following is the Fourier transform of h2[n] = (1/3)nu[n]?

Consider a continuous-time LTI system for which the input x(t) and output y(t) are related by the differential equation