If a monochromatic light beam with quantum energy value of 4.0 eV is incident upon a photocell where the work function of the target metal is 1.60 eV, what is the maximum kinetic energy of ejected electrons?
a. 4.6 eV
c. 2.4 eV
b. 4.8 eV
d. 1.4 eV
C
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A 40.0-g block of ice at -15.00°C is dropped into a calorimeter (of negligible heat capacity) containing water at 15.00°C. When equilibrium is reached, the final temperature is 8.00°C
How much water did the calorimeter contain initially? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg. A) 302 g B) 345 g C) 405 g D) 546 g E) 634 g
When a fixed amount of ideal gas goes through an isochoric process,
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature must increase. E) its pressure must increase.
For 1 gram of radioactive material that has a half-life of one year, after 4 years the original radioactive material left will be
A) 0 g. B) 1/2 g. C) 1/4 g. D) 1/8 g. E) none of the above
A pool ball moving at 3 m/s collides head-on with an identical pool ball that's initially at rest. Just after the collision, the second ball moves away at 2 m/s while the first ball
A) moves at 3 m/s in a direction opposite to the second ball. B) continues moving at 3 m/s in the same direction. C) is at rest. D) moves at 1 m/s in the same direction as the second ball. E) moves at 1 m/s in a direction opposite to the second ball.