The correct answer is "All of the above are correct"
The heat from the bonfire is transferred to the student's hands mainly, but not exclusively, through the process of RADIATION.
There are three mechanisms or processes of heat transfer: conduction, convection, and ratiation.
Conduction is carreid out by contact; it requires that the two objects are touching each other. This is not the case.
Convection is the heat transferred by the movement of the fluids (liquids ang gases). In some extent this happens in this case, but it is not the dominant effect becasue air is not a very good conductor. Specially if there is not much air movement (wind).
Thermal radiation is carried out by electromagnetic waves. When there is a source of intense heat, like the fire, the heat is propagated by radiation.
Then really, the heat from the bonfire gets to the student's hands by convection and radiation, but as fire is very intense (its temperature is very high), and as long as the air is calmed, the dominant process is radiation. If there is wind, convection starts to be important.
Dependent and Independent variables are regarded as variables in mathematical and statistical modeling and of course in some other aspects.
The independent variable is this case is the amount of salt.
- In this kind of scenario, one can think of independent and dependent variables in terms of cause and effect.
- An independent variable is the variable we assume to be the cause, while a dependent variable is assumed as the effect.
- Therefore, with this case, the amount of salt would cause a decrease in the number of plants.
- While the effect of increasing the amount of salt would be seen in the number of plants.
Learn more about dependent and independent variable: brainly.com/question/25223322
