The energy associated with a particular electronic transition is given as 256 kJ/mol. What is the wavelength of this radiation when the light passes from vacuum into quartz, which has a refractive index of 1.46? Potentially useful constants: h = 6.626 × 10^-34 J s; c = 3 × 10^8 m s^-1; and 1 mol of photons = 6.02 × 10^23 photons.
a) 295 nm
b) 269 nm
c) 320 nm
d) 483 nm
e) 337 nm
For the system described in the previous question, what is the percentage of this light that would be reflected at the vacuum-quartz interface?
a) 28.6%
b) 4.6%
c) 1.5%
d) 3.5%
e) 6.3%
Which of the following may be deduced from an ultraviolet (UV) absorption spectrum of a molecule?
a) The presence of halides
b) The vibrational energy states of the molecule
c) The rotational energy states of the molecule
d) The presence of conjugated double bonds
e) The structure of regular crystals
Very high-speed data acquisition (i.e., detection frequency) is required for the detector used in a time-of-flight mass spectrometer. For a time-of-flight MS with a flight tube of 1.50 m, where all ions enter the flight tube with an accelerating voltage of 9.5 kV, which detector of the following detection frequency can be used to identify an ion of 250 Da from an ion of 251 Da? Assume all ions have +1 charge. Potentially useful constants: 1 kV = 1000 V; charge of an electron = 1.60 × 10^-19 coulombs; 1 Da = 1.66 × 10^-27 kg; and 1 Hz = 1 s^-1
a) 1 MHz (1 × 10^6 Hz)
b) 10 MHz
c) 1 GHz (1 × 10^9 Hz)
d) 10 GHz
e) None of the above