40. Determine the amount of time for polonium-210 to decay to one fourth its original quantity. The
half-life of polonium-210 is 138 days. Please show all work. (ref: p.808-813)

276 days

Explanation:

in order to decay to half, it will be 138 days. in order to half that again down to a quarter, it will be another 138 days. 138+138 is 276, thus, 276 days.

magnified images possible images can be real = projected onto a screen

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is