A guitar string is made to vibrate. What makes the pitch of the note increase? a decrease in the amplitude of vibration
a decrease in the frequency of vibration
an increase in the amplitude of vibration
an increase in the frequency of vibration
which of the above?

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.