Name: Date: Grade: PREVIEW WORKSHEET FOR EXPERIMENT A RADIOACTIVITY AND ABSORPTI

Question

Name: Date: Grade: PREVIEW WORKSHEET FOR EXPERIMENT A RADIOACTIVITY AND ABSORPTION OF RADIOACTIVE PARTICLES Fill-in-the-blank survey about some basic atomic and nuclear information. In the fill in each blank with the appropriate word or following number. You can get most of these answers by and the rest by Googling the topic. a) The three main building blocks of the atom are the neatron -, te, hewtran and the b) The and the are the two nuclear particles and, collectively they are called c) The d) Of the two nucleons, thes electrically positive and the is the extranuclear atomic particle and it is electrically is electrically neutral. e) The diameter of an atom is of the order of m and the diameter of a nucleus is of the order of m. Itfollows that the cross-sectional area of an atom is about times the cross- sectional area of a nucleus. The atomic number of an atom denotes the number of f in the nucleus; it also denotes the number of g) The atomic mass number denotes the number of h) An atom denoted by 17X4" has in the extranuclear structure of the atom. in the nucleus of the atom. protons in its nucleus, _ neutrons in its nucleus, and One electron volt ofenergy is is the SI unit constructed from kg, m, and s. Erg is the 'cgs'unit, constructed from g. cm, ands.) An MeV of energy means The basic equation relating mass and its energy equivalence is developed in what is generally called Einstein's theory of If 1 kilogram of mass is converted into energy, the amount of energy so produced is electrons in its extra nuclear structure. i) ergs ofenergy or Joules of energy. (Joule j) k) electron volts of energy _- This equation is I) joules, ergs, or kilowatt-hours, or barrels of oil energy-equivalent. (I brl. of oil energy equivalent is about 5.80 X10 BTU. BTU is constructed in the 'British' system in the same way as calorie in SI.) m) The three radioactive particles commonly found in nature are called particles, and _particles. n) The source of radioactive particles is the o) The radioactive particle called an of the atom. particle has the same structure as the nucleus of

Explanation / Answer

(b) The proton and the neutron are the two nuclear particles and collectively are called the nucleons.

(c) The electron is the extranuclear atomic particle and it is electrically negative.

(d) Proton is electrically positive and the neutron is electrically neutral.

(e) The diameter of the atom is of the order of nanometers and the diameter of the nucleus is of the order of fermimeters.

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