A radioactive isotope of lead has a half-life of 10.6 hours. A small sample of lead containing this isotope has a count rate of 8000 counts per
minute.
How long will it be before the count rate is 1000 counts per minute?
Time =
hours

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

What is a costume plot? why is it important to a film or theater production?