8answers - Homework #8 1. a. b. c. d. e. f. Which type of...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Homework #8 1. Which type of molecular spectroscopy is used to determine force constants in molecules? a. rotational b. vibrational c. electronic d. a and b e. all of the above f. none of the above ANS: B Recall that force constants are related to the vibrations of molecules, not their rotational motion or their electronic states; thus, vibrational spectroscopy can be used to determine the force constants, answer B. 2. Of the following types of radiation, which has the longest wavelength? a. radio waves b. microwaves c. X-ray d. visible e. infrared f. ultraviolet ANS: A Refer to Table 20.1 on p. 826 and Figure 4.3 on p. 118. 3. Of the following types of radiation, which has the highest frequency? a. radio waves b. microwaves c. X-ray d. visible e. infrared f. ultraviolet ANS: C Refer to Table 20.1 on p. 826 and Figure 4.3 on p. 118. 4. Of the following types of radiation, which has the highest energy? a. radio waves b. Microwaves c. X-ray d. Visible e. Infrared f. Ultraviolet ANS: C Refer to Table 20.1 on p. 826 and Figure 4.3 on p. 118 and use the relationship E = h ! .
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
5. The zero point energy associated with a vibration of frequency ! is equal to a. 2B b. 1/2 hv c. hv d. hc e. none of the above ANS: B E v = (v+1/2)h ! and so for the v = 0 vibrational energy level, the zero point energy can be calculated to be 1/2 h ! , which is option B. 6. In the parabolic harmonic oscillator approximation for diatomic molecules, the spacing between vibrational energy levels for a vibration of frequency ! is equal to a. 2B b. 1/2 hv c. hv d. hc e. none of the above ANS: C E v = (v+1/2)h ! . The spacing between the levelsmay be simply determined by considering two states, e.g. v=1 and v=2, for which " E =E 2 -E 1 = (5/2) hv – (3/2) hv = hv , letter C. 7. What is the reduced mass of the NO molecule in atomic mass units (amu) a. 16 amu b. 14 amu c. 7.5 amu d. 0.13 amu ANS: C Formula for reduced mass, μ is given on p. 832. In this case, m N m O m N + m O = (14.007)(15.999) 14.007 + 15.999 = 7.4684
Background image of page 2
8. Which type of radiation is used in vibrational spectroscopy? a. radio waves
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/30/2008 for the course CHEM 1411 taught by Professor Parkin during the Spring '08 term at Columbia.

Page1 / 8

8answers - Homework #8 1. a. b. c. d. e. f. Which type of...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online