ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Item RG151002: Water gives off an increasing amount of energy as its temperature is increasing, and gives off a steady amount of energy when its temperature stays constant.
A student places a lamp near a container of water. He turns on the lamp and then monitors the temperature of the water throughout the day.
At 8:00 a.m., the water in the container is 25°C. At 10:00 a.m., the temperature of the water in the container has increased to 30°C. The water stays at that temperature for the hour. Which of the following statements correctly describes the rate at which energy is given off by the water over this three-hour period?
- The water gives off a steady amount of energy from 8:00 a.m. to 11:00 a.m. because all objects radiate energy at the same rate.
- The water gives off an increasing amount of energy from 8:00 a.m. to 10:00 a.m. as the temperature of the water is increasing, and then gives off a steady amount of energy from 10:00 a.m. to 11:00 a.m. because the temperature stays constant.
- The water does not give off any energy from 8:00 a.m. to 10:00 a.m. even though the temperature is increasing, and then gives off a steady amount of energy from 10:00 a.m. to 11:00 a.m.
- No energy is given off by the water during the three-hour period because it is absorbing energy from the lamp.
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
||||
|---|---|---|---|---|---|---|---|---|
| n = 1150 |
4–5 n = 0 | 6–8 n = 685 |
9–12 n = 465 |
Male n = 506 |
Female n = 616 |
English n = 998 |
Other n = 123 |
|
| A. | 21% | N/A | 21% | 21% | 23% | 19% | 21% | 23% |
| B. | 45% | N/A | 47% | 44% | 45% | 46% | 45% | 45% |
| C. | 16% | N/A | 17% | 15% | 16% | 16% | 16% | 20% |
| D. | 18% | N/A | 16% | 20% | 16% | 19% | 18% | 13% |