Certain planes of a crystal of halite have a spacing of 0.399 nm. the crystal is irradiated by a beam of x-rays. first order constructive interference occurs when the beam makes an angle of 20° with the planes. what is the wavelength of the x-rays?

If steel is more dense that lake water, why can a boat float

Pl asaaap ! match the term to the correct description. a type of wave that transfers energy where the particles in the medium move perpendicular to the direction in which the energy is traveling. a type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling. movement that is back and forth, like an equal sign = a type of wave that transfers energy where the particles in the medium move in a circle motion while the energy travels left or right. movement that is like a t transfers energy from one location to another 1. wave 2. parallel movement 3. perpendicular movement 4. transverse wave 5. longitudinal wave 6. surface wave

Energy flows from the producer level to the level. is called