A sample of a radioactive elements must contain atoms

A.
with a stable nuclei

B.
with unstable nuclei

C.
in the excited state

D.
in the ground state

hi there!

your question asks at which segment does freezing occur.

since we're talking about water, the freezing point of water will be 32 degrees fahrenheit or below.

hope this ! ~

small = small current large mag large current

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray