AI Tutor
Back to 10.3 Radioactive Decay

10.3 Exercise 12

Avg difficulty 2.5

World War II aircraft had instruments with glowing radium-painted dials. The activity of one such instrument was 1.0×1051.0 \times 10^{5} Bq when new. (a) What mass of 226Ra^{226} \text{R} \text{a} was present? (b) After some years, the phosphors on the dials deteriorated chemically, but the radium did not escape. What is the activity of this instrument 57.0 years after it was made?

OpenStax University Physics Volume 3, 10.3 Radioactive Decay, exercise 12

AI Tutor

Adapted from University Physics Volume 3 © 2016 Rice University. Licensed under CC BY 4.0. Source: University Physics Volume 3. Imported at revision db44eb9.