Laredo Community College
Science Department
CHEM 1411 Practice Exam Chapter 6 Newton 1
Name: TEST #
Equations
c = ln E = h n E = h c/l
En = ( - 1/n2 )× RHrn = n2a0H y = E y
RH = 2.18 x 10-18 J h = 6.63 x 10-34 J ×s c = 2.998 x 108 m s-1
Part I. Multiple Choice
Circle the letter of the BEST answer on the test here. When you have finished, use a #2 pencil (provided)
and completely darken the letter on the Scantron form which corresponds to your choice. If you make a
mistake, erase the wrong answer completely. Each question is worth 3 points.
1. The velocity of electromagnetic radiation in a vacuum is m/s.
(A) 2.179 x 10-19 (B) 2.998 x 108(C) 6.626 x 10-34
(D) 6.022 x 1023 (E) 9.109 x 10-28
2. Planck’s constant, the proportionality constant between the energy and frequency of a photon,
has the value J·s.
(A) 2.179 x 10-19 (B) 2.998 x 108(C) 6.626 x 10-34
(D) 6.022 x 1023 (E) 9.109 x 10-28
3. The frequency of ultraviolet radiation with a wavelength of 15.3 nm is s-1 .
(A) 1.96 x 1016 (B) 1.96 x 107(C) 4.59
(D) 4.59 x 10-9 (E) 1.53 x 10-8
4. The wavelength of a photon is greatest in the case of .
(A) X-radiation. (B) visible light.
(C) ultraviolet radiation. (D) infrared radiation
5. According to the Bohr model of the atom, emission of electromagnetic radiation by heated
atoms in a vacuum is directly due to .
(A) photons absorbed by atoms
(B) particle emission from the nucleus
(C) momentum possessed by electrons
(D) electrons being excited from an inner to outer orbit
(E) electrons falling from an outer to an inner orbit
