On a temperature versus time graph, how does the temperature at the beginning of a change of state compare with the temperature
at the end of the change?
always lower
always the same
usually lower
usually higher
always lower
always the same
usually lower
usually higher
2 answers:
Answer:
The temperature is always same.
Explanation:
The change of state of matter occurs at the constant temperature, because the heat energy given to the matter is used to change the state in this condition.
So, in the beginning and at the end of the change, the temperature remains constant.
The graph between temperature and time is a straight line parallel to time axis as shown.
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Answer:
The speed of the bat is 5.02 m/s.
Explanation:
Given that,
Frequency = 30.0 kHz
Frequency of echo = 900 Hz
We need to calculate the frequency
Using formula of beat frequency
Put the value into the formula
We need to calculate the speed of the bat
Using Doppler equation
Put the value into the formula
Hence, The speed of the bat is 5.02 m/s.