Which field of study did Christian Doppler's work influence the most? A. Chemical reactions
B. Climate changes
C. Forces and motion
D. Light waves

D Lifht Waves

Explanation:

described how the observed frequency of light and sound waves is affected by the relative motion of the source and the detector. 

Know as the Foppler Effect

first to quantify the change in frequency of a wave motion

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

thats how its supposed to be