Recommended ways of reducing sun exposure include staying out of the sun during midday (10:00 a.m. to 4:00 p.m.), wearing protective clothing (including a hat to shade the face and neck, long sleeves, and long pants), and using sunscreen with a sun protective factor (SPF) of ______ or higher. 25 15 5 45 Question 98 Which of the following statements regarding lung cancer is FALSE? For most people, symptoms of lung cancer do not appear until the disease is advanced. Lung cancer is the leading cause of cancer death. Chest X-rays are recommended as a routine screening test for lung cancer. Lung cancer is the second most commonly diagnosed cancer for men and women.
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Sri K.
Excessive exposure to sunlight increases the risk of skin cancer because some of the photons have enough energy to break chemical bonds in biological molecules. These bonds require approximately $250-800 \mathrm{~kJ} / \mathrm{mol}$ of energy to break. The energy of a single photon is given by $E=h c / \lambda,$ where $E$ is the energy of the photon in $J, h$ is Planck's constant $\left(6.626 \times 10^{-34} \mathrm{~J} \cdot \mathrm{s}\right),$ and $c$ is the speed of light $\left(3.00 \times 10^{8} \mathrm{~m} / \mathrm{s}\right) .$ Determine which kinds of light contain enough energy to break chemical bonds in biological molecules by calculating the total energy in $1 \mathrm{~mol}$ of photons for light of each wavelength. (a) infrared light $(1500 \mathrm{nm})$ (b) visible light $(500 \mathrm{nm})$ (c) ultraviolet light $(150 \mathrm{nm})$
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