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1)     What two things are required to have refraction?

Out of phase wave.jpg The image above represents: (Use this image for the next two questions)

What is the amplitude in the following picture? Screenshot (89).png

In this picture, what wave parameter is indicated by the question mark? Screenshot (85).png

What change typically occurs to the propagation velocity when the density is increased?

Which of these mediums would have a propagation velocity closest to that of “soft tissue”?

Which factor has more effect on speed?

Which statement is true regarding electromagnetic waves (choose all that apply).

0.0043 MHz = ?? kHz

What is the period? Screenshot (83).png