An ALGaAs laser with bandgap = 1.55 eV forms a quantum well laser with an active region of 5 nm thick. Assuming that the effective mass of the valence and conduction bands are twice the mass of an electron what is the shortest wavelength that would be emitted, owing to electric current flowing through the active region?

area of focus

dang that balls went far

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.