Why is it impossible for the mass of radioactive particles to decrease by half in radioactive decay after a half-life? Explain
What will be an ideal response?
Only in spontaneous fission are the decay products' masses comparable to half
the mass. In all other cases, the mass of the particle released is much smaller than the mass
of the releasing nucleus. The decrease of mass is independent of any time, such as half-life.
The reason some people believe this to be the case is confusion about the meaning of half
life, the time required for half of a given sample of identical nuclei to decay.
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Fill in the blank(s) with correct word
S waves and P waves are earthquake body waves. S and P stand for
a. sudden and post. b. sigma and pi. c. slow and proper. d. secondary and primary.
A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm. What is the mass of this ion? (e = 1.60 × 10-19 C)
A) 11 × 10-27 kg B) 6.7 × 10-27 kg C) 3.3 × 10-27 kg D) 8.2 × 10-27 kg
Rotational Kinetic Energy: Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A. The small sphere arrives first. B. Both reach the bottom at the same time. C. The large sphere arrives first.