A doubly-ionized lithium atom Li++, which has 3 protons, undergoes a transition from the n = 5 state to the n = 4 state
What is the wavelength of the photon which is emitted during this transition? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 650 nm B) 550 nm C) 450 nm D) 350 nm E) 750 nm
C
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Almost all the helium in the universe was formed between 2-15 minutes after the Big Bang
Indicate whether the statement is true or false
A very long straight wire carrying 2.0 A lies along the x-axis. A second very long parallel wire carrying 3.0 A in the same direction is positioned parallel to the x-axis and passes through the point (0, 1.0 m)
What is the magnitude of the magnetic field at the point (0, 0, 1.0 m)?
Compared to Saturn, Jupiter is about
A) 100 times more massive. B) twice the diameter, but less dense. C) half as dense, but the same mass since it is larger. D) three times more massive and denser. E) half as massive and denser.
Coulomb's Law: As shown in the figure, three charges are at corners of a rectangle. The charge in the bottom right corner is Q = - 90 nC, and all the other quantities are accurate to two significant figures. What is the magnitude of the net electrical force on Q due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 3.8 × 10-2 N B. 2.8 × 10-2 N C. 5.3 × 10-2 N D. 7.1 × 10-2 N