Explain how we can estimate the geological age of a planetary surface from its number of impact craters
What will be an ideal response?
Even though impacts still occur today, the vast majority of craters formed during the bombardment period that ended around 3.8 billion years ago. A surface region that is still saturated with craters must have remained essentially undisturbed for the last 3.8 billion years. In contrast, a surface region that has few craters indicates that the original craters must have been somehow "erased" since then.
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Indicate whether the statement is true or false
During an isothermal process, 5.0 J of heat is removed from an ideal gas. How much work does the gas do during this process?
A) 5.0 J B) 10 J C) -5.0 J D) 2.0 J E) 0.00 J
The ionization energy for the hydrogen atom is 13.6 eV. What is the energy of a photon that is emitted as a hydrogen atom makes a transition between the n = 6 and n = 4 states?
a. 1.13 eV b. 0.47 eV c. 0.09 eV d. 3.40 eV e. 6.80 eV
As an electron moves closer to the nucleus, it ________ energy.
A. generates B. absorbs C. quantizes D. loses E. gains