Physics 5250 Midterm Exam I. Fall 2017 Carbon-14 has a half-life of 5730 years.
ID: 1789221 • Letter: P
Question
Physics 5250 Midterm Exam I. Fall 2017 Carbon-14 has a half-life of 5730 years. If a found parchment contains 73% of the current ratio of 1c/tc (which is considered to be constant) how old is the parchment? 2. A 100-eV electron is scattered in the direction of an incident x-ray. Find the wavelength of that X-ray considering that the electron was at rest before the scattering. h c 0X10 At high LET, one of the scenarios includes annihilation of hydroxyl (OH) radicals. W it mean and why it can happen at high LET? Why it may not? 3. 4. Name the most deleterious DNA lesion. dou they play in radiation damage?Explanation / Answer
1.
We can use a formula,
t= ln(N/N0)*t1/2 / -0.693
t=ln(73/100)*5730/(-0.693)
t=2602.15 years old
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