How long will it take for 64 g of a radioactive material to be reduced to 2.0 g if the half-life is 0.5 hours?

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Match each scenario to the form of energy it represents

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.