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It is so he could figure out the effect on humans. So Planck exposed some immigrants to radioactivity for a small amount of money. 85% of them died in the first 10 weeks. The other 15% died inthe next few months.

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13y ago
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14y ago

he found himself able to obtain a new radiation formula, which was in close agreement with actual measurements under all conditions.

He had found that in seeking a relationship between the energy emitted or absorbed by a body and the frequency of radiation he had to introduce a constant of proportionality, which could only take integral multiples of a certain quantity.

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12y ago

Planck began his work by trying to understand the nature of black-body radiation; ie, that of objects glowing from heat. His initial attempt failed to properly explain the spectrum of this radiation, so (by his own admission, out of desperation) he developed a hypothesis that light energy from black-bodies could only be emitted in discrete "chunks" he called "quanta," and that the energy of each such quanta was proportional to the frequency of the light. He didn't really think these quanta actually EXISTED, he just noted the mathematical fact that this assumpion led to a perfect prediction of black-body specta. It took ten years and a LOT of prodding by Albert Einstein for Planck to accept the existence of photons as more than mathematical curiosities.

Ironically, both Planck and Einstein went to their graves without accepting the quantum theories of later physicists -- theories that never would have happened without their work.

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10y ago

matter can absorb light only in certain specific amounts

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Q: What idea did max planck propose to help explain why a blackbody radiator did not give off light of increasingly high frequency as its temperature increased?
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