According to the 2nd law of thermodynamics when there can be more ways something can happen it's called and it keeps going up as the time progresses.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation