Select the option on which Bohr's model was not based
1.Only certain orbits are stable. In these states, electrons do not emit energy in the form of radiation.
2.Radiation is emitted when electrons make a transition from one energy state to another; the frequency of the emitted photon is related to the change in the atom's energy and independent of the frequency of the electron's orbital motion.
3.Electrons move in circular orbits around the nucleus.
4.Angular momentum is dependent solely on energy, and thus is also quantized.
3
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If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will
A) come to an abrupt stop at Earth's center. B) speed up until it gets to Earth's center. C) speed up until it reaches Earth's other side. D) slow down until it reaches Earth's center.
Rub electrons from your hair with a comb and the comb becomes
A) negatively charged. B) positively charged. C) discharged.
A common fuel impurity in fossil fuels is ______________
Fill in the blank(s) with correct word
The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 10^6 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?