A free electron has a wave function ? = A cos (2.0 x 108 x). (a) What is the electron's wavelength? (b) What is the electron's kinetic energy?
What will be an ideal response?
(a) 3.1 x 10-8 m
(b) 1.5 x 10-3 eV
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New York is east of Toledo but in the same time zone. When is sunset in Toledo compared to sunset in New York?
What will be an ideal response?
The radius of a super-Earth generally falls in the range:
A) above 5 Earth radii.
B) between 2 and 5 Earth radii.
C) between 1.25 and 2 Earth radii.
D) between 0.75 and 1.25 Earth radii.
E) below 0.75 Earth radii.
Although it is highly unlikely to happen, suppose that we suddenly discovered that all these years we'd been wrong about the distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy?
A) It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought. B) It would not have any effect on our estimate of the distance to the Andromeda Galaxy. C) It would mean the distance to the Andromeda Galaxy is 10% less than we thought. D) It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore that we have no idea of the true distance to the Andromeda Galaxy.
Work is done on an object to increase its total energy. Which one of the following is true?
A. Both the kinetic energy and potential energy can be larger B. The total work done must be equal to the energy lost to heat and sound C. If the potential energy increases, then the kinetic energy must decrease D. The object must have a larger speed and smaller height above the ground