electromagnetic waves, Xray for example, can damage soft tissue so ultrasound might often be a better choice. That favors I
If you are looking for an internal crack in a steel beam, an electromagnetic wave will not likely help much. However again a sound or vibration wave might reflect and refract at the boundary and show that something is wrong. IV
Electromagnetic and mechanical waves have different characteristics that make them advantageous for certain applications. Select the reasons that mechanical waves, such as ultrasound, are used for soft tissue imaging and to identify fractures in metals.
I) mechanical waves are less likely to damage materials than most electromagnetic waves.
II) mechanical waves have more energy than electromagnetic waves
III) mechanical waves can transmit results more rapidly than electromagnetic waves
IV) mechanical waves generate vibrations that are sensitive to changes in temperature and density
A) I and IV
B) I and III
C) II and IV
D) II and III
PLEASE HELP
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