Niels Bohr postulated that the hydrogen electron radiates energy only when it makes a(n) ______________ from one allowed orbit to another
Fill in the blank(s) with correct word
transition, or quantum jump
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The terrestrial planets are thought to have formed by accreting solid planetesimals all with about the same composition. This means
a. they were initially molten forming an iron core first, then they accreted a silicate crust later. b. they were initially molten forming a silicate core first, then they accreted an iron crust later. c. they were initially collections of solid particles which melted then differentiated into a high density iron metal core and low density silicate crust. d. they were initially collections of solid particles which melted then differentiated into a high density silicate core and low density iron metal crust.
Which one of the following statements is true concerning resistors connected in parallel within an electric circuit?
a) The potential difference across each of the resistors is the same. b) The current through each of the resistors is the same. c) The energy dissipated by each of the resistors is the same. d) The resistance of each of the resistors is the same. e) The resistivity of each of the resistors is the same.
__________ in an x-ray spectrum of an atom occur because electrons in the atom make transitions to lower energy levels after being bombarded with high energy electrons
Fill in the blank(s) with correct word
A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the COP of the refrigerator?
a. 5.7 b. 4.6 c. 6.5 d. 7.2 e. 3.6