about an hour about a day about a week about a month about forever

You have a piano, and you ask for the best piano tuner EVER. You ask her to tune the piano perfectly. She says “No problem, it will only

take”...20% 20% 20%20%20%

1. About an hour

2. About a day

3. About a week

4. About a month

5. About forever

300 of 250

The speed of a photon in vacuum is known precisely in all circumstances. It follows from the uncertainty principle that nothing can be known

about the photon’s postion.33% 33%33%

1. True

2. False

3. False, but because the speed is not really known precisely

300 of 250

A free electron moves along the x-axis, and has a localized wave function. The uncertainty in its momentum is

decreased if:

20% 20% 20%20%20%1. The wave function is made more narrow

2. The wave function is made less narrow

3. Wave function is unchanged, but its energy is increased

4. Wave function is unchanged, but its energy is decreased

5. None of the above

300 of 250

Documents