Astronomers use the Doppler effect<span> to measure the frequency of light waves as an object is moving with respect to the observer</span>
Answer:
Valence electron pairs are the total sum of lone pairs and bond pairs in the molecule. The electrons possess negative charge on them. They repel each other due to the presence of same charge. The lone pairs repel other electrons strongly, which are present around the central atom.
The law of conservation of energy states that when one
form of energy is converted into another, no
energy is destroyed in the process. The answer is letter B. Energy cannot be
created nor destroyed, it can only be converted from one form into the other.
