Question Detail

PHY 104 PHY 104 Past Questions Objective Question
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Question

A student has three radioactive sources X, Y and Z. He devised the following experiment to determine what type of radiation each source is emitting. The student found that the radiation from X was stopped by a sheet of paper, Y was partially stopped by a few cm of lead and Z was stopped by a few mm of Aluminium. Which of following correctly identified each type of radiation?
Options
A X = alpha-particles, Y = beta-particles, Z = gamma rays
B X = alpha particles, Y = gamma rays, Z = beta particles
Correct Answer
C X = gamma rays, Y = beta particles, Z = alpha particles
D X = beta particles, Y = gamma rays, Z = alpha particles
Correct Answer

Option B is the correct answer.

Detailed Explanation

Alpha particles are stopped by paper. Beta particles are stopped by a few mm of aluminium. Gamma rays are partially stopped by a few cm of lead. Since X was stopped by paper, X is alpha. Z was stopped by a few mm of aluminium, so Z is beta. Y was partially stopped by lead, so Y is gamma.

Hint

Recall the penetrating power of alpha, beta, and gamma radiation.

Question Info

Course: PHY 104
Topic: PHY 104 Past Questions
Type: Objective
Difficulty: Not specified
Question 832 of 947
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