Need help, please. :) Explain why it is difficult to develop devices for human use that rely on waves found higher in the electromagnetic spectrum, such as gamma waves?

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

How would a small bar magnet be oriented when placed at position x?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?