Question

2 attempts left Check my work Be sure to answer all parts. Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. (a) A molecular vibration absorbs radiation of wavelength 209 pm. What frequency (in s) corresponds to that wavelength? Enter your answer in scientific notation. x 10 ,- (b) A molecular vibration has a frequency of vibration of 9.803 x 101) Hz. What wavelength (in um) corresponds to that frequency? um

Answer 1

a)

Given:

lambda = 209 um = 2.09*10^-4 m

use:

f = c/lambda

=(3.0*10^8 m/s)/(2.09*10^-4 m)

= 1.435*10^12 s-1

Answer: 1.43*10^12 s-1

b)

Given:

f = 9.803*10^13 s-1

use:

lambda = c/f

=(3.0*10^8 m/s)/(9.803*10^13 s-1)

= 3.06*10^-6 m

= 3.06 um

Answer: 3.06 um