What happens to the domains in this iron nail when the south pole of a magnet approaches from the top

What type of light does this light bulb produce most (i. e. at what wavelength does the spectrum have maximum intensity)?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

The energy released by a nuclear fusion reaction is produced when