6. In a Microbiology laboratory, certain tests are done under controlled temperature. The variation in temperature is by fixed number o

Question

6. In a Microbiology laboratory, certain tests are done under controlled temperature. The variation
in temperature is by fixed number of degrees per minute. Evaluate each of the following:
(a) The temperature at the beginning of an experiment is 20°C. It increases by 4°C per minute.
What is the temperature at the end of the experiment if it took 15 minutes to complete?
(b) The temperature is made to fall by 3°C per minute. The temperature at the end of an
experiment is -7°C, which took 13 minutes to complete. What was the temperature at
the beginning of the experiment?

Please give me the answer

with explain

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Parker 1 day 2021-10-13T07:13:50+00:00 1 Answer 0 views 0

Answers ( )

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    2021-10-13T07:15:13+00:00

    The temperature at the beginning of expt = 20°c.

    Rate of temperature increase = 4°c per min

    Time for completion of expt = 15 min

    Total rise in temperature = 15 × 4 = 60℃

    Temperature at the end of the experiment

    = 20+60 = 80℃

    b)

    Rate of fall of temperature = 3℃ per min.

    Temperature at the end of an experiment = -7℃

    Time for completion of expt = 13 min

    Total fall in temperature = 13 × 3 = 39℃

    Let the starting temperature be x ℃

    =>x – 39 = -7

    => x = -7 + 39 = 32℃

    Temperature at the beginning of the experiment was 32℃

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