First, this does not appear to be a complete problem statement since you trail off with "the rate at which it will now radiate is closest to " which looks like it should be followed by choices, plus you say the answer is wrong but you give no indication WHY you think it is wrong, which again seems to imply that there are choices for the answer and your answer isn't any of them.Tinkylo said:Homework Statement:: A cube at 102 °C radiates heat at a rate of 64 J/s. If its surface temperature is increased to 189 °C, the rate at which it will now radiate is closest to
Relevant Equations:: P2/P1=(T2/T1)^4
I have tried to use the above equation.
P2/64=(189/102)^4
P2=754.4431
But I don't know why the answer is wrong. Please help!
The temperatures here are absolute temperatures.Tinkylo said:Relevant Equations:: P2/P1=(T2/T1)^4
Agreed. I fixed the thread title to make it actually describe the problem, instead of being an empty statement "Please help with the Question! ".phinds said:Second, that subject line is terrible. Of course you have a problem or question. That's what the homework section is for, but why make people guess what KIND of problem instead of saying something like "need help with a thermodynamics problem" ?
Radiation from a cube at 189 °C refers to the emission of electromagnetic waves from a cube-shaped object that has been heated to a temperature of 189 °C. This type of radiation is also known as thermal radiation or blackbody radiation.
The temperature of the cube directly affects the amount of radiation emitted. As the temperature increases, the cube will emit more radiation at a higher intensity and with shorter wavelengths. This is because the thermal energy of the cube's particles increases, causing them to vibrate and emit more electromagnetic waves.
The surface area of the cube does not directly affect the amount of radiation emitted. However, a larger surface area means that more of the cube's particles are exposed to the surrounding environment, allowing for more efficient transfer of thermal energy and thus, more radiation emitted.
Radiation from a cube at 189 °C is a type of thermal radiation, which is different from other types of radiation such as nuclear radiation or electromagnetic radiation. Thermal radiation is emitted by objects that have a temperature above absolute zero, while nuclear radiation is emitted by unstable atomic nuclei and electromagnetic radiation includes visible light, radio waves, and X-rays.
No, radiation from a cube at 189 °C is not harmful to humans. This type of radiation is in the infrared range, which is not capable of ionizing atoms or damaging DNA. In fact, we experience thermal radiation from objects around us every day, such as the warmth from the sun or a fire.