A physicist has developed a device that generates a beam of alpha particles (eac

Question

A physicist has developed a device that generates a beam of alpha particles (each of which is a helium nucleus, consisting of two protons, two neutrons, and no electrons). The device ejects a steady stream of 4910 alpha particles per second. You are testing different shielding materials for a test chamber that win house the alpha particle generator. You prepare a sheet of one potential material in an electrically neutral state, mount it on a perfectly insulating stand, and fire the alpha particle device at it for 22 3 seconds Afterward, you measure that the charge of the sheet is 9.67 times 10-15 coulombs Assume that none of the alpha particles bounced back from the sheet, meaning that the alpha particles either were captured by the shielding or penetrated completely through the shielding What percentage of the alpha part ides penetrated completely through the shielding material?

Explanation / Answer

Charge of 1 proton=1.6x10^-19 C
charge of 1 alpha particle=charge 0f 2 protons=3.2x10^-19C
Final charge of sheet=9.67x10^-15C
So no. of alpha particles absorbed=(9.67x10^-15)/(3.2x10^-19)=30218.75~30219
Total no. of alpha particles hit in 22.3 s=4910x22.3=109493
So. no. of alpha particles that penetrated completely=109493-30219=79274
percentage of alpha particles that penetrated completely=79274x100%/109493=72.4%

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.