Question A siren is moving past Mary as she sits stuck in traffic. To Mary, the pitch of
the siren changes as it passes her position. What causes this to happen?
A. The energy of the wave increased as the siren passed Mary's
location.
B. The frequency of the sound the siren makes changes as it passes
Mary
C. The sound waves in front of the siren bunch up, and those behind
the siren spread out.
D. The amplitude of the sound waves in front of the siren are larger
than those behind the siren.
SUBMIT

Ithink the answer is a or d.

Ithe undersigned only for use your own email and delete any and copies and of the itself and to be there is a good timewhat does a decrease in temperature indicate about the molecules in a sample of liquid water? decreased chemical energy of the moleculesdecreased kinetic energy of the moleculesincreased chemical energy of the moleculesincreased kinetic energy of the moleculeshow does a sample of helium at 15 â°c compare to a sample of helium at 215 k? the helium at 15 â°c has a higher average kinetic energy than the sample at 215 k.the helium at 15 â°c has lower nuclear energy than the sample at 215 k.the helium at 15 â°c has slower-moving atoms than the sample at 215 k.the helium at 15 â°c has smaller atoms than the sample at 215 k.

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.

It decreases by 4 is your answer mark brainliest