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Ch. 7 WS Key

# Ch. 7 WS Key - Chapter 7 Workbook 1 Microwaves such as...

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Chapter 7 Workbook 1. Microwaves, such as those used in radar or to cook food, have wavelengths greater than 3.0 mm. What is the frequency of this radiation? Calculate the energy associated with this wavelength. ν = 1 x 10 11 Hz; E= 6.63 x 10 -23 J 2. Sodium vapor lamps used for public lighting emit 589 nm yellow light. How much energy is emitted by a) an excited sodium atom when it generates a photon? b) 1.00 mol of photons of excited sodium atoms at this wavelength? 3.38 x 10 -19 J/photon; 2.03 x 10 5 J/mol 3. Determine the wavelength of the line in the Balmer series of hydrogen corresponding to the transition from n= 5 to n= 2. 434 nm 4. What electron transition in a hydrogen atom, ending in the orbit n= 5, will produce light of wavelength 3740 nm? n= 8

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5. What is the wavelength associated with electrons traveling at one-tenth the speed of light? λ = 2.43 x 10 -11 m 6. What must be the velocity, in m/s, of a beam of electrons if they are to display a de Broglie wavelength of 1 μ m? 728 m/s
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Ch. 7 WS Key - Chapter 7 Workbook 1 Microwaves such as...

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