The energy released when an unstable electron state decays has an uncertainty of about 0.50 eV
What is the uncertainty in the life-time of the level? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 1.3 × 10-11 s B) 1.3 × 10-15 s C) 8.3 × 10-11 s D) 8.3 × 10-15 s
B
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Which of the following is the shell electron configuration for carbon?
a. 3, 3 b. 6 c. 2, 4 d. 1, 5
Consider the hydrogen atom, singly ionized helium atom, and the doubly ionized lithium atom. Arrange these atoms from highest energy ground state to lowest energy ground state
a. H, He+, Li++ b. Li++, He+, H c. H, Li++, He+ d. Since each of these atoms has only one electron, they all have the same energy ground state.
A(n) _____ is a closed curve around two points called the foci, such that the total distance from one focus to the curve and back to the other focus remains constant
A) ellipse B) equant C) deferent D) paradigm
How can an old pulsar have a very short pulsar period, say less than 0.03 seconds?
What will be an ideal response?