Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should
A) use light of a longer wavelength.
B) use light of a shorter wavelength.
C) use light of the same wavelength but increase its intensity.
D) use light of the same wavelength but decrease its intensity.
B
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How many atoms are there in a face centered cubic unit cell that has an atom at 0, 0, 0?
What will be an ideal response?
The fact that desert sand is very hot in the day and very cold at night is evidence that the specific heat capacity of sand is relatively
A) low. B) high. C) practically absent.
A 1200-kg car moving at 15.6 m/s suddenly collides with a stationary car of mass 1500kg. If the two vehicles lock together, what is their combined velocity immediately after the collision?
A) 12.1 m/s B) 8.6 m/s C) 6.9 m/s D) 5.5 m/s
It is a well-known fact that water has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium
The same amount of heat, 30 calories, is added to each. Which statement is true? A) They remain in thermal equilibrium. B) They are no longer in thermal equilibrium; the iron is warmer. C) They are no longer in thermal equilibrium; the water is warmer. D) It is impossible to say without knowing the exact mass involved. E) It is impossible to say without knowing the exact specific heat capacities.