What are three objects that are magnetic?

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

By examining a wave’s pattern after it interacts with a barrier or gap, measurements can be made to better understand certain wave phenomena. what is a broad question you can answer by doing this experiment?

What is the period of a wave traveling 5 m/s if its wavelength is 20 m/s