What color of light is not absorbed by a blue object?

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 many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Both independent and dependent clauses