Explanation:
RAM={mass number ×relative abundance (%) + mass number ×relative abundance (%)} ÷100%
so take (91.05×20) +(8.95×22)
Positrons are spontaneously emitted from the nuclei of potassium -37.
<span>Express the answer in scientific notation and with the correct number of significant figures:
(6.32 x 10-4) ÷ 12.64
5.00 x 10^-5</span>
The answer is C
because plants use light energy from the sun to make their own food providing energy. The food created is a type of sugar.
This would make it definitely not A or D. The only answers left would be B and C but, technically the sunlight doesn't deliver the sugar straight to the plant so I'd go with C.
Hope that his helped!
The material needed to stop a beta particle is c. thin pieces of wood.
