Physics Past Questions and Answers

(a) (i) Explain why x-rays can be used to produce photographs of fractures in bones.<br/>(ii) List four uses of x-rays other than in medicine.<br/>(b) State the energy transformations which takes place during the operation of an x-ray tube.<br/>(c) (i) Explain three named dangers to which human beings may be exposed when subjected to large doses of x-rays.<br/>(ii) State two precautions that must be taken by persons working with x-rays.<br/>(d) In an x-ray tube, an electron is accelerated from rest towards a tungsten target biased at a potential of 33 kV. Calculate, for the electron, the<br/>(i) kinetic energy;<br/>(ii) velocity. [h = 6.6 x 10\(^{-14}\) Js; Me = 9.1 x10\(^{-31}\) kg; c = 3.0 x 10\(^4\) ms\(^{-1}\); e = 1.6 x 10\(^{-19}\) C.]

The rising of a liquid in an open and ended glass tube of narrow bore is

The rising of a liquid in an open and ended glass tube of narrow bore is

Which of the following units is equivalent to the watt?

Which of the following statements about pressure in a liquid is correct?