1. if an energy intensity of 2000 W is exerted by a spherical source, what will
ID: 3901769 • Letter: 1
Question
1. if an energy intensity of 2000 W is exerted by a spherical source, what will be its average power output at a distance of 12 m from it?
a. 3.1 W/m^2 b. 1.1 W/m^2 c. 2.1 W/m^2 d. 4.1 W/m^2
2. a radioactive sample has a half-life of 2.5 min. what fraction of the sample is left after 40 min?
a. 1/256 b. 1/40 c. 1/16 d. 1/8
3. an atom has 8 protons and 17 nucleons. if it undergoes beta - decay, what are the number of protons and neutrons, respectively, in the daugher nucleus?
a. 7,16 b. 8,18 c. 9,17 d. 8,17
Explanation / Answer
1. 1.1 W/m^2 (apply I = power/areA)
2. c. 1/16
3. DUYRING BETA DECAY, aTOMIV INCREASES BY 1 UNIT AND MASS NO. REMAINS SAME
SO c. 9,17
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.