Physics, 05.05.2020 09:36, momof7hardings
The Doppler effect is an effect produced by a moving source of sound or electromagnetic waves due to the relative motion of a source or a receiver. If an emergency vehicle approaches Bob and moves away from Jill, how does the frequency of the siren change?
A) Neither Bob or Jill perceive any change in the frequency of the siren.
B) As an emergency vehicle approaches Bob the frequency appears to increase.
C) As an emergency vehicle moves away from Jill the frequency appears to increase.
D) Bob does not notice any change until the vehicle passes him and the siren increases.
Answers: 3
Physics, 22.06.2019 02:30, raularriaga
If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?
Answers: 1
Physics, 22.06.2019 14:00, mariahgriego4126
Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.
Answers: 1
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