J.J. Thomson's experiments provided evidence that an atom B.contains negatively charged particles.
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Answer:
The answer is below
Explanation:
Firstly, the frequency is received by the wall and then it is reflected and received by the bat.
The frequency received by the wall (f') is given by:
f' = 
The - sign is used when the observer is moving away from the source and + sign when the observer is moving towards the source.
Since the bat is moving towards the wall, we use a positive sign. Hence:
f' = 
The frequency reflected and received by the bat f" is:
f'' = 
- sign is used when the source moves toward the observer and + is used when the source moves away
since the bat moves towards the wall, then::
f'' = 
v = speed of sound in air = 331 m/s, vo = velocity of observer = 5 m/s, vs = velocity of source = 5 m/s. Therefore:

The answer to the question is (C)
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Answer:
figure out what the letter mean , the figure how it's worth