Please help:) The diagram shows the position of the principal lines in the visible spectrum of atomic hydrogen
and some of the corresponding energy levels of the hydrogen atom. Determine the energy of a photon of blue light (435nm) emitted in the hydrogen spectrum

How is the gravitational force related to the distance between two objects?

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices