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What is the angle of reflection in the imaging diagram below? The incident angle is 30 degrees.  

At what incident angle does the strongest reflection occur at the boundary of a specular reflector?

Which of the following interactions with matter is independent of frequency?

How do you focus the ultrasound beam in the fraunhoefer zone?

If the depth of the natural focus is decreased by a factor of 4 what must have happened to the wavelength of the sound beam?

Identify the transducer type used for each of the following images.       A                B               C                   D

If the crystal diameter is 4 mm, what is the minimum distance a part 2 objects can be in the lateral plane and still distinguished as separate objects

Why is it more advantageous to use a concave crystal surface to focus the beam over a lens?

Choose the correct labels for the transducer below.

What is the optimal thickness for manufacturing the matching layer in the transducer?