After three half-lives, ________ of an original, radioactive, parent isotope remains and the rest has decayed into the daughter isotope
A) 75% or three-fourths (3/4)
B) 50% or one-half (1/2)
C) 25% or one-fourth (1/4)
D) 12.5% or one-eighth (1/8)
Answer: D
Environmental & Atmospheric Sciences
You might also like to view...
A floating seagull is bobbed by waves whose crests are 40 m apart moving at 10 m/s. These waves encounter the gull every
A. 400 s. B. 30 s. C. 0.25 s. D. 4 s.
Environmental & Atmospheric Sciences
Describe, with the aid of a diagram, the orbital paths followed by geostationary and polar-orbiting satellites.
What will be an ideal response?
Environmental & Atmospheric Sciences
Where abundant groundwater percolates through limestones, ________ may be formed.
A. artesian wells B. sinkholes and caverns C. aquicludes D. perched water tables
Environmental & Atmospheric Sciences
The term used by geologists for all water flowing in a channel is _____.
a.) creek b.) stream c.) river d.) tributary e.) brook
Environmental & Atmospheric Sciences