A beat frequency of 5 Hz is heard by a piano tuner. By how many Hz must the frequency be increased in the piano string to make it in tune?

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

What is the fate of the electrons that interact with a specimen in an electron microscope?

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.