During world war ii, tritium (3h) was a component of fluorescent watch dials and hands. assume you have such a watch that was made in january 1944. if 16% or more of the original tritium was needed to read the dial in dark places, until what year could you read the time at night? (for 3h, t1/2 = 12.3 yr.)

1976

Explanation:

The first order decay of tritium can be represented through the following expression.

where,

[H]t is the concentration of tritium after a time t has elapsed

[H]₀ is the initial concentration of tritium

k is the rate constant

Given the half-life (t1/2) is 12.3 years, we can calculate the rate constant using the following expression.

The concentration of tritium at certain time is 16% of the initial concentration, that is, [H]t = 0.16 [H]₀.

If the watch was made in 1944, you could read the time until 1944 + 32 = 1976.

indium, and thallium have three electrons i think

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?