For Which One of the Following Problems Did Max Planck

question 2

Multiple Choice

For which one of the following problems did Max Planck make contributions that eventually led to the development of the "quantum" hypothesis?

• A)photoelectric effect
• B)uncertainty principle
• C)blackbody radiation curves
• D)the motion of the earth in the ether
• E)the invariance of the speed of light in a vacuum

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