PLEASE HELP QUICK The Doppler Effect is noticed in which of the following situations?

a. When a car with its honking horn moves towards you and then drives away.

b. When birds fly in formation, and the goose at the front is honking.

c. When a drum is struck hard.

d. When sound does not travel in a vacuum.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

level 4 to level 2 : ))

the correct answer would be b) volume versus temperature, because they are also directly proportional.