If you shoot some electron's through a double split what do you get

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

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

In which of these cases are the two wave points considered to be in phase with each other?