Practice: A low-pressure mercury-vapor lamp has a characteristic emission line at 253 nm. Knowing that this lamp is putting out 11.8 watts of light energy, how many mercury atoms are emitted per second during operation?
Concept #1: The electromagnetic spectrum represents the full range of frequencies and wavelengths that spread across forms of electromagnetic radiation.
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Concept #2: By examining the electromagnetic spectrum connections between energy, frequency, wavelength and amplitude can be made.
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Concept #3: Using the speed of light constant allows for the correlation between frequency and wavelength.
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Example #1:
Calculate the wavelength (in nm) of the red light emitted by a neon sign with a frequency of 4.16 ×108 MHz.
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Example #2:
What is the energy, in joules, of a mole of photons associated with visible light of wavelength 493 nm?
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Example #3:
A laser pulse produces 1.242 kJ of energy. It was experimentally determined that the pulse contains 3.50 x 1022 photons. Determine the wavelength of light (in meters) emitted by one photon.
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Example #4:
How much total energy (in μJ/mol) would it take to remove the electrons from a mole of hydrogen atoms?
The ionization energy for a hydrogen atom is 2.178 x 10-18 J.
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Practice: A low-pressure mercury-vapor lamp has a characteristic emission line at 253 nm. Knowing that this lamp is putting out 11.8 watts of light energy, how many mercury atoms are emitted per second during operation?
Ask unlimited questions and get expert help right away.