Atomic and Nuclear Physics Answers

6. What is the trend in ionization energy as the atomic number increases?

5. Which of the following best explains the Periodic Law and its application to the Elements?

 A. Elements form groups because they are formed in similar circumstances and therefore behave similarly in nature

B. The Periodic Law is consequence of law of multiple proportion discovered by John Dalton in 1803

 C. Elements from the same group have similar physical and chemical properties due to the fact they similar electronic structures

D. The periodic law is a simple coincidence of the names given to the elements, i.e. Halogens, Alkali Metals, Noble gases, etc. It has no fundamental bearing on the chemical or physical properties of the elements

Compute the total binding energy and the. binding energy per nucleon for

(a) 7Li (b) 20Ne (c) 56Fe (d) 235U.

An lemming with a jet pack accelerates upward at 4.3 m/s2. If the lemming ( with the jet pack) has a mass of 55 kg. What is the upward force applied by the jet pack

The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. what is the kinetic energy of the electron ejected from the surface of the metal

Dmitri Mendeleev is often regarded as the Father of the Periodic Table. Would you say that Henry Moseley deserves the recognition more than him?

Calculate the total number of atoms and total mass of 99mTc present in 15 mCi (555 MBq) 99mTc activity (t1/2 = 6 h).

A sample of material contains 1 microgram of iodine-131. Note that, iodine-131 plays a major role as a radioactive isotope present in nuclear and it a major contributor to the health hazards when released into the atmosphere during an accident. Iodine-131 has a half-life of 8.02 days.

a)The number of iodine-131 atoms initially present.

b)The activity of the iodine-131 in curies.

c)The number of iodine-131 atoms that will remain in 50 days.

d)The time it will take for the activity to reach 0.1 mCi.

1.    A radioactive sample with a half-life of  3hrs contains 25-mCi radioactivity. The radioactivity of the sample after 9 days days would be?

2.1.    A sample of material contains 1 microgram of iodine-131. Note that, iodine-131 plays a major role as a radioactive isotope present in nuclear and it a major contributor to the health hazards when released into the atmosphere during an accident. Iodine-131 has a half-life of 8.02 days.

a)The number of iodine-131 atoms initially present.

b)The activity of the iodine-131 in curies.

c)The number of iodine-131 atoms that will remain in 50 days.

d)The time it will take for the activity to reach 0.1 mCi.