When an electron beam strikes a block of copper, X-rays of frequency 1.07 X 10^19 Hz are emitted. What is the wavelength of these x-rays? Answer in units of nm.

Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an intergrating center

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

What is the molecular weight of copper