Line spectra

The video explains the electromagnetic spectrum emitted by hot or excited matter, focusing on how each emission line corresponds to differences between energy levels in atoms or molecules. It highlights that each element has a unique set of emission lines, which allows astronomers to determine the composition of distant stars.

What is emitted by hot or excited matter?

• Gravitational waves

• Sound waves

• Neutrinos

• Electromagnetic spectrum

What does each emission line represent in an atom or molecule?

• A change in temperature

• A variation in pressure

• A difference between two energy levels

• A shift in magnetic field

How can astronomers determine the composition of distant stars?

• By calculating their distance

• By measuring their brightness

• By analyzing their emission lines

• By observing their size

What is unique to each element in terms of emission?

• Its size

• Its set of emission lines

• Its color

• Its temperature

What allows astronomers to identify elements in stars?

• The star's brightness

• The star's distance

• The star's temperature

• The star's emission lines