Equations On Equation Sheet Plancks Equation Wave Equation Beers Law A abc E energy frequency wavelength Plancks Constant h 6626 x 10 34 Js Speed of light c 3 x 10 ID: 775624
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Slide1
Ms. DiOrio
Light Practice Problems
Slide2Equations
On Equation Sheet
Planck’s Equation: Wave Equation: Beer’s Law: A = abcE = energy = frequency = wavelengthPlanck’s Constant: h = 6.626 x 10-34 JsSpeed of light: c = 3 x 108 m/s
NOT on Equation Sheet
De Broglie Equation: Bohr Equation:
Slide3What is the wavelength of a FM radio transmission at 88.9 MHz?
Slide4What is the frequency of light with a wavelength of 660 nm?
Slide5Ultraviolet radiation has a frequency of 6.8 × 10
15
s
-1
. Calculate the energy, in joules, of the photon.
Slide6A sodium vapor lamp emits light photons with a wavelength of 5.89 × 10
-7
m. What is the energy of these photons?
Slide7A ruby laser produces red light that has a wavelength of 500 nm. Calculate its energy in joules.
Slide8What is the frequency of UV light that has an energy of 2.39 × 10
-18
J?
Slide9Determine the de Broglie wavelength (in nm) associated with a neutron traveling at a speed of 5.0 x 10
3
m/s. The mass of a neutron is 1.67 x 10
–24
g.
Slide10What is the wavelength of an electron moving at 5.31 x 10
6
m/s if an electron has a mass of 9.11 x 10
-31
kg?
Slide11An atom of helium has a de Broglie wavelength of 4.30 x 10¯
12
m. What is its velocity?
Slide12Calculate the wavelength of the radiation emitted by a hydrogen atom when an electron falls from the n=3 to the n=2 orbital in the Bohr model.
Slide13What is the ionization energy of an electron in the n=3 shell of a hydrogen atom?
Slide14What is the molar absorptivity of the following compound as measured in a 1 cm cuvette?
Concentration: 25uM
Absorption: 0.5874
Slide15What is the concentration of the following compound as measured in a 1 cm cuvette:
Molar absorptivity: 4525 M
-1
cm
-1
Absorption: 0.6358
Slide16A student wishes to analyze the concentration of an unidentified yellow solution. What wavelength should be used to measure absorption?