If you move an electron in an atom from a low energy level to a higher energy level within the atom, we say that the atom is
a. in the ground state.
b. ionized.
c. dissociated.
d. an excited atom.
e. neutralized.
D
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What did the IAU establish in 1928? a. The IAU classified Pluto as a dwarf planet
b. The IAU published official names of all constellations. c. The IAU recorded 88 constellations with defined boundaries. d. The IAU recognized additional orbiting bodies in the Kuiper Belt. e. The IAU recorded all the mythologies associated with 88 constellations.
When observing the Sun in visible light, the photosphere appears brighter than the corona. However, when observing the Sun in x-rays, the corona appears brighter. The reason for this is that
A. the gas in the corona has a much lower density than that in the photosphere and so emits mostly emission lines at x-ray wavelengths.
B. the temperature in the corona is more than 1 million K while that in the photosphere is about 5800 K and so the corona emits a larger fraction of its luminosity at short wavelengths.
C. more nuclear reactions are occurring in the corona than the photosphere and these produce high-energy (x-ray and gamma-ray) photons.
An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor. At time t = 0 the voltage is zero
At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = -Imax, where Imax is the current amplitude. What is the unknown element? A) a resistor B) an inductor C) a capacitor D) an inductor or a capacitor
If a nucleus decays by alpha decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more neutrons than the original nucleus. B) The daughter nucleus has more protons than the original nucleus. C) The daughter nucleus has fewer protons than the original nucleus. D) The daughter nucleus has the same number of nucleons as the original nucleus. E) The daughter nucleus has fewer neutrons than the original nucleus.