2. During the COVID-19 pandemic, everyone must adhere to the "Standard Operation Precaution" (SOP). Among the tools used in equipping the SOP enforcement procedure is a thermometer. (a) Explain FIVE advantages of using infrared thermometer. (b) As a student, Ridzuan decided to run a test using a thermometer to measure the temperature of his mother's herbal soup at regular intervals. The results of his observation are shown in a temperature-time graph below. The mass of the herbal soup is 0.80 kg. (c) Temperature/C 90 -80- 70+ 60- 50 40 30 20 050 150 200 250 300 350 Time/s (i) herbal soup. Describe the temperature change of the (ii) What is the temperature of the room? (iii) Calculate the amount of heat lost from the herbal soup after 150 s (specific heat capacity of the soup = 4250 J kg-¹⁰c-1) (iv) Calculate the time a 48 W heater takes to reheat the herbal soup from room temperature to its original temperature. When Ridzuan re-heated the herbal soup, his mother advised him to cover the pot rather than keep it open to shorten the reheating time. What is the gas law that Ridzuan has been implemented? Explain.
2. During the COVID-19 pandemic, everyone must adhere to the "Standard Operation Precaution" (SOP). Among the tools used in equipping the SOP enforcement procedure is a thermometer. (a) Explain FIVE advantages of using infrared thermometer. (b) As a student, Ridzuan decided to run a test using a thermometer to measure the temperature of his mother's herbal soup at regular intervals. The results of his observation are shown in a temperature-time graph below. The mass of the herbal soup is 0.80 kg. (c) Temperature/C 90 -80- 70+ 60- 50 40 30 20 050 150 200 250 300 350 Time/s (i) herbal soup. Describe the temperature change of the (ii) What is the temperature of the room? (iii) Calculate the amount of heat lost from the herbal soup after 150 s (specific heat capacity of the soup = 4250 J kg-¹⁰c-1) (iv) Calculate the time a 48 W heater takes to reheat the herbal soup from room temperature to its original temperature. When Ridzuan re-heated the herbal soup, his mother advised him to cover the pot rather than keep it open to shorten the reheating time. What is the gas law that Ridzuan has been implemented? Explain.
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Transcribed Image Text:2. During the COVID-19 pandemic, everyone must adhere to the "Standard Operation Precaution" (SOP). Among the tools used in
equipping the SOP enforcement procedure is a thermometer.
(a)
Explain FIVE advantages of using infrared
thermometer.
(b)
As a student, Ridzuan decided to run a test using a
thermometer to measure the temperature of his
mother's herbal soup at regular intervals. The
results of his observation are shown in a
temperature-time graph below. The mass of the
herbal soup is 0.80 kg.
(c)
Temperature/C
90
80
70-
60-
-50
40
30
20
0
50 100 150 200 250 300 350
Time / s
Describe the temperature change of the
(i)
herbal soup.
(ii)
What is the temperature of the room?
(iii)
Calculate the amount of heat lost from the
herbal soup after 150 s (specific heat capacity of
the soup = 4250 J kg-1°C-1)
(iv) Calculate the time a 48 W heater takes to
reheat the herbal soup from room temperature to
its original temperature.
When Ridzuan re-heated the herbal soup, his
mother advised him to cover the pot rather than
keep it open to shorten the reheating time. What is
the gas law that Ridzuan has been implemented?
Explain.
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