A friend produces a Geiger counter to check the local background ...

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A friend produces a Geiger counter to check the local background radiation.
 
  It ticks. Another friend, who normally fears most that which is understood least, makes an effort to keep away from the region of the Geiger counter and looks to you for advice. What do you say?
  A) Run away as fast as you can
  B) The Geiger counter is emitting radiation.
  C) The Geiger counter is detecting naturally occurring radiation from your body.
  D) Wear heavy clothes.

Question 2

A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?
 
  A) It will be cut to one-quarter its original size.
  B) It will be cut in half.
  C) It will double.
  D) It will become four times as large.
  E) It will become eight times as large.

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Answer to Question 1

Answer: C

Answer to Question 2

C

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