Chapter_7_Review_Problems

Chapter_7_Review_Problems - Chapter 7 Review Problems 1. A...

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1. A laser produces a light of wavelength 575 nm. How many photons of this light would have to strike a material for the material to absorb 55.1 kJ? a. 1.59 x 10 23 b. 5.31 x 10 22 c. 3.45 x 10 20 d. 6.36 x 10 23 e. 2.76 x 10 22 2. A 5.25 milliwatt (1W = 1J/s) laser produces a beam of radiation with a wavelength of 632.8 nm. How many photons are produced by the laser in 60.0 seconds? a. 1.00 x 10 18 photons b. 1.00 x 10 21 photons c. 1.00 x 10 24 photons d. 1.00 x l0 27 photons e. 1.00 x l0 30 photons 3. What is the wavelength of light emitted when an electron in the third energy level goes down to the ground state in the hydrogen atom? a. 103 nm b. 205 nm c. 421 nm d. 630 nm e. 821 nm 4. A hydrogen atom electron in an excited state with n = 8, emits light with a wavelength of 955.8 nm when going to a lower energy state. What is the value of n for this lower energy state? a.
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Chapter_7_Review_Problems - Chapter 7 Review Problems 1. A...

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