A. alpha and beta particles
B. alpha and gamma particles
C. beta and gamma particles
D. gamma particles only
Correct Answer: Option A
A. alpha and beta particles
![A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]](https://myschool.ng/storage/classroom/4288835607_maths-15.jpg "A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]")
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