3.18. According to a revolutionary postulate made by Max Planck in 1901, the fre

Question

3.18. According to a revolutionary postulate made by Max Planck in 1901, the frequency of an electromagnetic wave traveling in free space can assume only certain discrete values. TF(Explain your answer) 3.19. The velocity of an electron is determined by the group velocity of the wave packet that represents it, in both nonrelativistic and relativistic theories. (Give best choice and explain your answer.)T F 3.20. Position and momentum along a given coordinate axis can both be measured precisely at the same time in quantum mechanics, but the total energy is uncertain (Give best choice and explain your answer.)

Explanation / Answer

1) True, According to Max Planck, the energy of the particle is discrete and it is in the order of Planck's constant hbar.

2) True, Group velocity is always less than velocity light but phase velocity doesn't.

3) False, since position and momentum are canonically conjugate to each other, so they must also obey the uncertainty principle.

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