Answer:
A PROFESSOR WARNED HIM NOT TO GO INTO PHYSICS. Not long after the 16-year-old Planck got to the University of Munich in 1874, physics professor Philipp von Jolly tried to dissuade the young student from going into theoretical physics. Jolly argued that other scientists had basically figured out all there was to know.
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Answer:
well it depends of the distance, but u get your frequency and u times it by a round number if im correct
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Answer: I would go with D.
Explanation: Sorry if it is incorrect