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| As a professor at Berlin University, what was the name of the local society wherein Planck had joined? | |
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| As a professor in Berlin University, Planck joined the German Physical Society ( Deutsche Physikaliche Gesellschaft, DPG); wherein from 1905 to 1909 he was the president. | |
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| How many graduate students Professor Planck had, when he statrted a six-semester course of lectures on theoritical physics? | |
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| The number of his graduate students was only about 20. | |
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| What was the problem that had been stated by Kirchhoff in 1859 about Black-body radiation? | |
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| The problem that had been stated by Kirchhoff in 1859 about Black-body radiation is: how does the intensity of the electromagnetic radiation emitted by a black body (a perfect absorber, also known as | |
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