How many days are required for a radioactive sample, with a half-life of 5.7 d and an initial activity of 1.07 × 105 Bq, to decay to an activity of 100 Bq?
A) 57 d
B) 46 d
C) 68 d
D) 39 d
A
You might also like to view...
What are the three modes of heat transfer?
What will be an ideal response?
Groombridge 34 is an M2 main sequence star. Based on this information, which statement is true? a. Groombridge 34 has a surface temperature that is more than the Sun
b. Groombridge 34 has mass that is greater than the Sun. c. Groombridge 34 is less luminous than the Sun. d. Groombridge 34 is more luminous than the Sun. e. Groombridge 34 is located near the upper left hand corner on the HR diagram.
What is the magnetic moment of a rectangular loop of 120 turns that carries 6.0 A if its dimensions are 40. mm × 8.0 cm?
What will be an ideal response?
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
A. diffract the light through a single slit. B. squint while looking in that direction. C. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. D. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. E. reflect the rays from that direction on a shiny metal surface.