If a surface has a work function of 1.5 eV and photons of energy 2.7 eV are shone on the surface, what is a possible kinetic energy of the electrons emitted from the surface?
A)
3.0 eV
B)
2.0 eV
C)
4.0 eV
D)
1.0 eV
E)
No electrons are emitted.
D
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The most important reason an object is observed to be shorter in a frame where it is moving than in a frame where it is at rest is that
A. The force of motion strongly compresses an object that is moving at relativistic speeds. B. “Simultaneity” is not a frame-independent concept. C. The measuring sticks used by the moving observer are Lorentz-contracted. D. The clocks used by the moving observer run slower.
An urban legend has it that the RAF was testing the windshields of their aircraft for bird strikes using a chicken cannon given to them by the USAF. The windshields kept breaking because they were using frozen chickens instead of fresh ones. Using your knowledge of physics, you would reason that the legend is
A. false - frozen and thawed chickens have the same momentum on impact. B. true - frozen chickens are harder and come to rest in a shorter time, C. increasing the force.
How many of the infinite number of Balmer spectrum lines are in the visible spectrum range?
A) none B) 2 C) 4 D) 6 E) infinite
What does the convective mass transfer coefficient represent?
What will be an ideal response?