The ratio of e/m values of a proton and an a-particle is:
Correct answer: A. 2:1
- A. 2:1
- B. 1:2
- C. 1:1
- D. 1:4
Explanation
Option A is correct.The ratio of e/m values of a proton and an alpha particle is 2:1. The charge of a proton is +1, and its mass is 1 u. The charge of an alpha particle is +2, and its mass is 4 u. The e/m value of a proton is therefore 1/1 = 1, and the e/m value of an alpha particle is 2/4 = 0.5. The ratio of these two values is 2/0.5 = 2:1.Therefore, the answer is 2:1.
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