What happens when an electron absorbs energy?
A.
The electron moves from a lower energy orbital to a higher energy orbital.
B.
The electron falls into the nucleus.
O
C.
The electron moves from a higher energy orbital to a lower energy orbital.
O
D.
The electron loses its charge.
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What is a metal replacement reaction

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

The first supersonic flight was in 1947. it was just above the speed of sound. which altitude would you expect captain yeager to have used for his flight