The radioisotope ra-224 decays by  emission to the ground state of rn-220 (94% probability) and to the first excited state of 0.241 mev above the ground state (5.5%). what are the energies of the two  particles?

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c