The following graph shows the rates of decay for four parent isotopes. based on the graph, which parent isotope most likely has a half-life of 13 billion years?
a
b
c
d

Which statement best explains why an object weight less on mercury than it does on earth

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.