Answer to Question #124631 in Atomic and Nuclear Physics for Albert Eshun

Question

14. . Living matter has an activity of 260 Bq/kg due to carbon – 14. If a sample of wood from a
burial site has an activity of 155 Bq/kg, estimate the age of the site. (Assume the half – life
of carbon – 14 is 5730 years).



20. 20. If the kinetic energy of an electron in the ground state hydrogen atom is 2.2 x 10-18 J,
calculate its momentum. (2 marks)
21. Calculate the radius of the 3rd orbit of an atom with 1 proton and 2 neutrons. (2 marks)
22. An x – ray tube operates at a d.c potential difference of 40 KV. Calculate the velocity of
the incident electrons. Assume charge – mass ratio of electron,
me
e
= 1.8 x 1011 C/kg.
(2 marks)
23. A piano string of length 76cm and mass per unit length of 6.91 x 10-3
kg/m is under a
tension of value 40N. What is the frequency of a note sounded by this string? (2 marks)
24. The position of a certain electron is determined at a certain time with an uncertainty of
10-10 m. Find the uncertainty in the electron's momentum.

Answer 1

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