Author Question: What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? ... (Read 101 times)

leilurhhh · **on:** Jul 29, 2018

What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605 10-27 kg)

A) 1.70 10-12 kg
B) 5.38 10-19 kg
C) 3.84 10-20 kg
D) 8.68 10-13 kg

Question 2

A very long thin wire produces a magnetic field of 0.0050 10-4 T at a distance of 3.0 mm. from the central axis of the wire. What is the magnitude of the current in the wire? (0 = 4 10-7 T m/

A)
A) 7.5 mA
B) 1.7 mA
C) 3300 mA
D) 24,000 mA