Kami Export - PS07-Light

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Brigham Young University *

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105

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Chemistry

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Jan 9, 2024

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Light 1. (a) Explain what a photon is in 1-3 sentences. (b) What does it mean for something to be ‘quantized’? Give examples of 3 everyday things that are quantized (for example, stairs are quantized). 2. Complete the following table. If the wavelength is given, calculate the frequency of a photon of that wavelength, and vice versa. Then calculate the energy of 1 photon of that wavelength or frequency. Label what part of the electromagnetic (EM) spectrum each photon is in. If it is in the visible region, state what color. 3. A typical microwave oven operates at 2.45 GHz. Calculate the wavelength of this electromagnetic radiation. How does this compare to the width of a typical microwave (the one in your home is about 30cm wide)? Assuming the waves are a standing wave, how many nodes are in the microwave? Wavelength Frequency (Hz, or s -1 ) E of 1 photon (J) EM range 2.99 x 10 ! 1.98 x 10 "#$ 3.0 x 10 %& 2.65 x 10 "%’ 585 nm 6.59 × 10 14 1.98 x 10 "%! 1.00 nm
4. The 3 centimeter band is a portion of the radio spectrum that is allocated to amateur radio and amateur satellite enthusiasts. What is the frequency of electromagnetic radiation with a wavelength of 3.00 cm? How does this compare to the 60 Hz frequency of the oscillations of alternating current (AC) from our electrical power grid? 5. Light with a wavelength of 614.5 nm looks orange. What is the energy, in joules, per photon of this orange light? What is the energy in eV (1 eV = 1.602 × 10 −19 J)? 6. Mammograms are a type of x-ray used to diagnose breast cancer. The x-rays used in mammograms have a wavelength of about 50.0 pm. Calculate the energy in one photon of this radiation. If one mammogram uses 3.0 × 10 %# photons, how much total energy is a woman exposed to when she receives a mammogram? 7. It takes about 3.9 eV to break apart or severely damage DNA (1 eV = 1.602 x 10 -22 kJ). Can UV light, dental X-rays, or medical X-rays damage your DNA?
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