Which of the following statatements is correct?
a. Thermos bottles keep food warm by combating heat loss through convection.
b. A thick quilt is an example of an isulator with a low R value
c. An object that is cool to the touch at room temperature is a poor conductor of heat
d. Wearing a white shirt on a hot, sunny day keeps you cool because it emits more solar energy than a darker shirt
e. All of th above statements a-d are all correct
f. None of the above statements a-d are all incorrect
a. is true, but a Thermos bottle also combats radiative heat loss.
The other statements are false.
To determine whether each statement is correct or incorrect, we will need to analyze each statement individually.
a. Thermos bottles keep food warm by combating heat loss through convection.
This statement is incorrect. Thermos bottles actually keep food warm by combating heat loss through conduction and radiation, not convection. Convection involves the transfer of heat through the movement of fluids or gases, which is not a significant factor in thermos bottles.
b. A thick quilt is an example of an insulator with a low R-value.
This statement is incorrect. A thick quilt is actually an example of an insulator with a high R-value. R-value measures the resistance of a material to heat flow, and a high R-value indicates better insulation. So, a thick quilt with high insulation properties will have a higher R-value.
c. An object that is cool to the touch at room temperature is a poor conductor of heat.
This statement is correct. When an object feels cool to the touch at room temperature, it indicates that the object is not readily transferring heat to your hand. Therefore, it is a poor conductor of heat. Insulators, such as wood or rubber, often feel cool to the touch as they do not efficiently conduct heat.
d. Wearing a white shirt on a hot, sunny day keeps you cool because it emits more solar energy than a darker shirt.
This statement is incorrect. The color of a shirt affects its ability to absorb or reflect solar radiation, but it does not directly relate to the amount of solar energy emitted by the shirt. Wearing a white shirt on a hot, sunny day can help keep you cool because white reflects more sunlight, reducing heat absorption compared to darker colors.
Based on our analysis, none of the above statements a-d are all correct. Therefore, the correct answer is:
f. None of the above statements a-d are all incorrect.