What creates a polar front? what forms the polar front jet stream?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

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.

Anybody wanna ? (picture included? )