Special relativity can be used to study an object in which frame of reference? a. a frame of reference that has a constant, negative acceleration b. a frame of reference that has no change in velocity c. a frame of reference that is moving in a circle d. a frame of reference that has a constant, positive acceleration

Special relativity led the path for general relativity; special relativity is in a sense a special application of the rules of general relativity. While general relativity is in position to tackle all of these problems, special relativity can tackle only problems in inertial frames. Inertial frame means that the frame of reference is inot accelerating. So, we disqualify answers A and D. However, remember that moving in a circle means that there is an acceleration, the centrifugal one, even if the speed does not change. Hence C is also incorrect.
The correct answer is B, since if there is no change in velocity, the frame does not accelerate and it is inertial.

3is a crest4 is a trough 2 is the amplitude 1 is the wavelength

The low lands i believe