A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of
alpha particles and gamma rays
alpha and beta particles
beta particles and gamma rays
alpha particles only
Explanation
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Alpha radiation consists of helium nuclei and is readily stopped by a sheet of paper. Beta radiation, consisting of electrons or positrons, is stopped by thin aluminum plate, but gamma radiation requires shielding by dense material such as lead, or concrete. option c very correct
To solve this, consider the penetrating power of different types of radioactive emissions:
* Alpha particles: These are the largest and least penetrating. They can be stopped by a sheet of paper or even a few centimeters of air.
* Beta particles: These are smaller and more penetrating than alpha particles. They can pass through paper but are stopped by a thin sheet of aluminum.
* Gamma rays: These are the most penetrating. They can pass through paper, aluminum, and even several centimeters of lead.
Therefore, the emissions that can pass through a sheet of paper are beta particles and gamma rays.
So the answer is (C).
