After 6400 years of undergoing alpha decay, a sample contains only 6.25% of the radium nuclei it initially had. What is the half-life of these radium nuclei?

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.

What is the temperature in degrees celsius of a substance with a tempature of 49k

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?