Which list of nuclear emissions is arranged in order from the greatest penetrating power to the least penetrating power?
(1) alpha particle, beta particle, gamma ray
(2) alpha particle, gamma ray, beta particle
(3) gamma ray, alpha particle, beta particle
(4) gamma ray, beta particle, alpha particle

(4) gamma ray, beta particle, alpha particle.

Explanation:

Penetration power is the capacity of a radiation to pass through any matter.

the penetration power is inversely proportional to the mass of particles or radiation.

Out of the given three rays, gamma rays are lightest then beta and then alpha.

Thus penetration power of gamma rays is highest.

Then beta particles

Then alpha particles.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer