~pls halp me~
two grams of an eight-gram radioactive substance are all that remains after ten minutes. what is the half-life (in minutes) of this substance?
a) 1
b) 2
c) 5
d) 10

Select the best definition for wavelength. the height of an oscillating electromagnetic wave the rate at which electromagnetic waves oscillate. the distance between two crests of an electromagnetic wave. the oscillations of electric and magnetic fields select the best definition for frequency. the oscillations of electric and magnetic fields. the height of an oscillating electromagnetic wave. the distance between two crests of an electromagnetic wave. the rate at which electromagnetic waves oscillate