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A dental X-ray typically affects 190 g of tissue and delivers about 4.1 μJ of energy using X-rays that have wavelengths of 0.025 nm. What is the energy Ephoton , in electron volts, of X-ray photons? Ephoton = How many photons, N, are absorbed during the dental X-ray? Assume the body absorbs all of the incident X-rays. N = photons

A dental X-ray typically affects 190 g of tissue and delivers about 4.1 μJ of energy using X-rays that have wavelengths of 0.025 nm. What is the energy Ephoton , in electron volts, of X-ray photons? Ephoton = How many photons, N, are absorbed during the dental X-ray? Assume the body absorbs all of the incident X-rays. N = photons

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A dental X-ray typically affects 190 g of tissue and delivers about 4.1 μ J of energy using X-rays that have wavelengths of 0.025 n m .
What is the energy E photon , in electron volts, of X-ray photons?
E photon =
◻ How many photons, N , are absorbed during the dental X-ray? Assume the body absorbs all of the incident X-rays.
N =
◻ photons

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Grading for Numeric Answers Tolerance Some numeric answers to questions need to be exact. For example, the answer to the question "How many days are in a week?" must be exactly 7. In general though, numeric answers are graded as correct if they fall within an acceptable range (or tolerance) of the official correct answer. For example, if the answer to a numeric problem with a tolerance of 2% was 105, then entering any value between approximately 103 and 107 would be graded as correct, as shown in the region shaded green below. The typical grading tolerance in Mastering is 2-3%, although this value may vary (e.g. more lenient) depending on the particular problem. A number line is marked at 100, 105, and 110, where 105 is the properly-rounded answer. A green shaded region extends beyond 105 by 2 percent of this value in each direction. 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