If the de Broglie wavelength of an electron is 43 nm, what is its velocity? The mass of an electron is 9.11 x 10–31 kg.

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

What electron configurations do atoms usually achieve by sharing electrons to form covalent bonds?