Context: In the last years of the nineteenth century, Planck was investigating the problem of black-body radiation first posed by Kirchhoff some forty years earlier. It is well known that hot objects glow, and that hotter objects glow brighter than cooler ones. The electromagnetic field obeys laws of motion similarly to a mass on a spring, and can come to thermal equilibrium with hot atoms. The hot object in equilibrium with light absorbs just as much light as it emits. If the object is black, meaning it absorbs all the light that hits it, then its thermal light emission is maximized.

Question: What was Planck studying in the last part of the nineteenth century?
Answer: the problem of black-body radiation

Question: Who posed the problem of black-body radiation?
Answer: Kirchhoff

Question: Cooler objects glow less than objects that are what?
Answer: hotter

Question: What does a black object do to any of the light that hits it?
Answer: it absorbs all the light

Question: What is maximized as a result of a black object absorbing all the light that hits it?
Answer: thermal light emission

Question: Planck studied what problem posed originally by Kirchhoff?
Answer: black-body radiation

Question: If an object is black, what is known about its thermal light emission?
Answer: its thermal light emission is maximized.

Question: What is known about the light absorption of a hot object in equilibrium with light?
Answer: absorbs just as much light as it emits

Question: Electromagnetic fields obey what laws?
Answer: laws of motion

Question: What type of radiation was Planck studying in the late 18th century?
Answer: Unanswerable

Question: How many years prior to Planck's study had the scientific community first avoided black body radiation?
Answer: Unanswerable

Question: What scientist never studied black body radiation?
Answer: Unanswerable

Question: What is required for the electromagnetic field to come to thermal differences?
Answer: Unanswerable

Question: What does a hot object in equilibrium reflect as much as it emits?
Answer: Unanswerable