How many quantum states are possible for an atomic electron for which n = 4?
how many quantum states are possible for an atomic electron for which n = 2 and m = 0?
find the de broglie wavelength of an electron accelerated across a 22,600 v potential difference in a tv tube.
a geiger counter reading of a radioactive sample is initially 7220 counts per minute. the same sample gives a reading of 402 counts per minute 10.9 h later. what is the sample's half-life?
if a rock containing u-238 initially reads 64.4 counts per minute on a geiger counter, what will its reading be 3 weeks later?
find the activity of a sample containing 8.73 multiply. gif 1014 iodine-131 nuclei (t1/2 = 8.0 days)
find the activity of a sample containing 5.91 multiply. gif 10-6 g of _27^60 text(co) (t1/2 = 5.27 years).
find the binding energy and the binding energy per nucleon of the _92^238 text(u) nucleus