1. Which of these can be used to observe the field of the magnet?
A. bits of paper
C. small pieces of cloth
B. iron fillings
D. saw dust
2
Irgeckich of thon
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Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.