A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
A)
1/2
B)
1/4
C)
1/8
D)
1/16
E)
1/32
D
You might also like to view...
Consider the sun and its largest planet Jupiter. On the line joining them, how far from the center of the sun is their center mass? Is it within or outside the sun? (Jupiter-sun distance is 778 × 106 km, diameter of the sun is 1
4 × 106 km, the sun is 1000 times as massive as Jupiter)
The part of the mantle located directly below the lithosphere is called the ______________
Fill in the blank(s) with correct word
A bolt of lightning strikes the ground 200 m from a 100-turn coil oriented vertically and with the plane of the coil pointing toward the lightning strike. The radius of the coil is 0.800 m and the current in the lightning bolt falls from 6.02 × 106 A to zero in 10.5 ?s. What is the voltage induced in the coil over this time period? [A question for future electrical engineers: is there any way
to get lightning to strike repeatedly at the same point?]
?
Alpha radiation is in fact which of the following?
a. high energy quanta c. helium nuclei b. positrons d. electrons