Question

Why is the ratio of neutrons to protons greater in the heavier elements? (A) The greater the number of protons, the weaker the proton-neutron strong nuclear force. (B) The greater the number of neutrons, the weaker the proton-neutron strong nuclear force. (C) The greater the number of protons, the greater the electrostatic force of repulsion. (D) The greater the number of neutrons, the greater the electrostatic force of repulsion. (E) There is actually a lesser ratio of neutrons to protons in the heavier elements.

A certain radioactive element has a half-life of 20 d. How long will it take 7/8 of the atoms originally present to disintegrate? (A) 20 d (B) 40 d (C) 60 d (D) 80 d (E) 100 d

In what type of radioactive decay are the mass numbers of the parent and daughter nuclei different? (A) alpha (B) beta (C) gamma (D) both alpha and beta (E) both beta and gamma

What are particles that participate in the strong nuclear interaction called? (A) neutrinos (B) hadrons (C) leptons (D) electrons (E) photons

At the present time, the truly elementary massive particles are thought to be (A) quarks, leptons, and vector bosons. (B) hadrons and baryons. (C) baryons and quarks. (D) leptons and hadrons. (E) quarks and photons.

Answer 1

C) is the correct answer

c)the greater the number of protons the greater the electrostatic force of repulsion.

the ratio of neutrons to protons greater in the heavier elements.among stable nuclie and naturally occuring nuclei the ratio generally increases with increasing atomic number this is because electrical repeulsive force between proton scale with distance differently than strong nuclear force of attraction.

B)hadrons are the particles that participate in strong nuclear interaction, because strong nuclear force holds most ordinary matter together because it confines quarks into hadrons particles such as the proton and neutron thus if hadrons are stuck by high energy particles they give rise to new hadrons instead of emitting freely moving radiation.

B)hadrons and baryons are the truely massive particles at the present time becausebaryons are made up of three quarks in the standard model. This class of particles includes protons and neutrons. Baryons and mesons are included in the overall class known as hadrons the particles which interact by the strong force.