Aparticle in an infinite square well with walls at x = 0, a starts out in an initial state described by a linear combination of the first two normalized stationary states, ψ(x, 0) = a(ψ1 + ψ2). if you measured the energy of the particle in the state ψ(x, t) at some later t, what values might you obtain, and with what probabilities?

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?