Shell Radius: If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n, then
A. its radius and binding energy will double.
B. its radius will quadruple and the binding energy will double.
C. its radius will double and the binding energy will quadruple.
D. its radius will quadruple and the binding energy will be reduced by a factor of four.
E. its radius and binding energy will quadruple.
Answer: D
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Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____
a. determine the relationship between the period of pulses and luminosity b. measure the mass of a star c. calculate a star's diameter d. determine the chemical composition of a Type I Cepheid e. narrow their study to eclipsing binary stars only
Dark energy is speeding up the expansion of the Universe.
Answer the following statement true (T) or false (F)
An iceberg weighing 1,000 tons is floating in the North Atlantic. Consider the gravitational forces on the iceberg due to the Earth, the Moon, and the Sun. Put these gravitational forces in order of increasing magnitude
You do not need to do any calculations. Use reasoning, or simply guess.
1.Earth < Moon < Sun 2.Earth < Sun < Moon 3.Moon < Sun < Earth 4.Moon < Earth < Sun 5.Sun < Moon < Earth 6.Sun < Earth < MoonWhich of the following is the simplest possible hydrocarbon?
A) CH4 B) H2 C) HC=CH D) H2C=CH2 E) C2H6