Which kind of wave requires a medium for propagation?
a. radio
b. seismic
c. gamma ray
d. visible light

What is the length x of the side of the triangle below? (hint: use the cosine function)

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.