18. How does a semiconductor become activated to produce electricity

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

What is the molar mass of potassium nitrate, kno3

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space