UV Luminance Spectroscopy What is the relationship between wavelength and wave number? Wavelength in nanometers x wavenumber = 1 Wavenumber = 1 / wavelength in centimeters Wavenumber - wavelength in nanometers = 1 None of these Wavelength in nanometers x wavenumber = 1 Wavenumber = 1 / wavelength in centimeters Wavenumber - wavelength in nanometers = 1 None of these ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy In the intersystem crossing All of these the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa) a molecule converts excess electronic energy to vibrational energy a molecule converts its excess energy to light, and emits a photon All of these the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa) a molecule converts excess electronic energy to vibrational energy a molecule converts its excess energy to light, and emits a photon ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy? None of these Because the sample won't fluoresce if the incident radiation is of low power Because the magnitude of the output signal is proportional to the power of the incident radiation To allow for scattering by the sample None of these Because the sample won't fluoresce if the incident radiation is of low power Because the magnitude of the output signal is proportional to the power of the incident radiation To allow for scattering by the sample ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy Why do fluorescence spectrometers often use double-beam optics? So a reference solution can be used All of these To compensate for power fluctuations in the radiation source To compensate for beam attenuation by the monochromator So a reference solution can be used All of these To compensate for power fluctuations in the radiation source To compensate for beam attenuation by the monochromator ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule? Because a change in dipole moment lowers the energy required for electronic transitions Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching All of these Because a change in dipole moment lowers the energy required for electronic transitions Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching All of these ANSWER DOWNLOAD EXAMIANS APP
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