CHEM 1021 EXAM |3RD EXAM Q&A.

CHEM 1021 EXAM |3RD EXAM Q&A.MULTIPLE CHOICE. 1. On the electromagnetic spectrum, visible light is immediately between two other wavelengths. Name them. A) infrared and ultraviolet B) microwave and x -ray C) infrared and x -ray D) radio and microwave E) gamma ray and ultraviolet Answer: A 2) Which of the following occur as the energy of a photon increases? A) the frequency decreases. B) the wavelength increases C) the wavelength gets shorter. D) the speed decreases. Answer: C 3) Determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1.76 × 103 kJ/mol. (Planck's constant h = 6.626 × 10—34 J·s) A) 113 nm B) 387 nm C) 68.0 nm D) 147 nm E) 885 nm Answer: C 4) In an experiment searching for the photoelectric effect, an incident beam of green light produced no ejected electrons from a metal. In order to eject electrons, the experimenter should A) increase the brightness of the light. B) decrease the brightness of the light. C) try yellow light. D) try blue light.