__________ 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
Characteristic peaks
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This diagram shows the orbital path of the Sun around the center of mass of our solar system over a 65-year period as it would appear from a distance of 30 light-years. If aliens had constructed this graph at their home star system, they could learn all of the following except
A) the fact that large, icy objects orbit the Sun in the Kuiper belt. B) the fact that the Sun has more than two planets. C) the mass and orbital period of Jupiter. D) the orbital distance of Saturn.
All the Galilean moons are in synchronous rotation, with the same face always pointed toward Jupiter, except for tidally stressed Io
Indicate whether the statement is true or false
Transmitting power at high voltage, e.g., 400,000 V, reduces the power loss for transmission lines. But such a voltage would destroy electrical devices in household use. How then can such 400,000 V electricity be used in a normal house?
a. The ground prongs on household plugs reduce the voltage to 120 V. b. Before reaching households, transformers are used to reduce the voltage appropriately. c. No matter the incoming voltage, a 120 V device only lets 120 V in. d. The 400,000 V is just theoretical; long distance transmission lines actually use 120 V.
A solar heated house loses about 7.4 × 10^7 cal through its outer surfaces on a typical 24-hour winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62°C by the solar collectors, and the house is maintained at 20°C? (Specific heat of rock is 0.21 cal/g • °C.)
a. 160 kg c. 6100 kg b. 1200 kg d. 8400 kg