What are the rules should be observed when using symbols units:

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

How would a small bar magnet be oriented when placed at position x?

Which sound characteristic is not affected by the relative motion of an object