Chapter 33 - Worked Solutions

to selected extension questions from the OUP text Senior Physics - Concepts in Context by Walding, Rapkins and Rossiter

Q2 :-

Potential difference V = 5.5 x 10⁴ V and given that the de Broglie wavelength l = h/m.v
h = 6.63 x 10^-34 Js, m_e = 9.11 x 10^-31 kg and charge q_e = 1.6 x 10^-19 C.
Then using ½.m.v² = q.V yields velocity v = 1.4 x 10⁸ m s^-1.
Hence wavelength l = 5.2 x 10^-12 m s^-1 by substitution.

Q5 :-

The correct chronological sequence is :- Roentgen, Ruska, Rohrer, Donald, Hounsfield and Damadian.

Q8 :-

Common radioisotopes are :-
Technetium-99 as a gamma emitter produced in a reactor.
Thallium-201 as an X-ray and gamma emitter produced in a cyclotron.
Fluorine-18 as a gamma emitter produced in a cyclotron.

Q9 :-

About 1.8 mSv subjected to g - radiation which is roughly the same as normal background yearly dose.

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