Electrons in atoms
a. orbit the nucleus in well-defined circular orbits.
b. radiate electromagnetic energy continuously.
c. act as if spread out in a "cloud" around the nucleus.
d. behave as predicted by quantum mechanics.
c, d
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A cast iron frying pan ¼ inch thick is used to prepare some food on a stove top. If the lower surface of the pan is at 600ºF and the upper surface is 500ºF, estimate the heat transfer through the pan per unit area.
What will be an ideal response?
A 30 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the second mode?
A. 10 cm B. 20 cm C. 30 cm D. 40 cm E. 60 cm
According to Galileo, which of these is a "natural" or "unforced" form of motion?
A) A stone falling straight downward. B) A book coming to rest as it slides along the floor. C) Both a stone falling straight downward and a sliding book coming to rest are natural motions. D) Neither a stone falling straight downward nor a sliding book coming to rest are natural motions.
What must be true in order for an atom to absorb a photon?
A) The photon must have energy matching the difference in energy between two energy levels in the atom. B) The atom must have lost all of its electrons. C) The photon must have enough energy to remove an electron from the atom. D) A or C E) B or C