A neutral atom has an electron configuration of 1s22s22p63s23p2. How many protons does it have in its nucleus?
A) 5
B) 11
C) 14
D) 20
E) 26
C
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The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values?
(c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 122 nm B) 203 nm C) 243 nm D) 389 nm E) 411 nm
A 150 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 2.00 
The smallest diameter the nail can be is
A. 9.77 mm. B. 8.22 mm. C. 7.97 mm. D. 7.52 mm. E. 6.03 mm.
Which of the following forms of electromagnetic radiation has a longer wavelength than visible light?
A) Gamma rays B) Ultraviolet radiation C) Infrared radiation D) X-rays
Pherical aberration can be minimized by
A. Blocking light rays going through the middle of the lens B. Blocking light rays going through the outer edge of the lens C. Using longer wavelength light D. Using shorter wavelength light