Multiple choice

Which of the following is NOT found in the Milky Way galaxy’s galactic halo?

A. A few lone stars
B. Dark matter
C. Some star clusters
D. The sun

Which of the following is the correct order of the components of the Milky Way galaxy from outermost to innermost

A. Thick Disc, thin disc, extreme disc, galactic halo, black hole

B. Thing disc, extreme disc, thick disc, galactic halo back hole

C. Galactic halo, thick disc, thing disc, extreme disc, black hole

D. Extreme disc, thick disc, thin disc, galactic halo, black hole

Which of the following represents an upside-down image?

Consider the particle-in-a-box problem in 1d. a particle with mass m is confined to move freely between two hard walls situated at x = 0 and x = l. the potential energy function is given as (a) describe the boundary conditions that must be satisfied by the wavefunctions ψ(x) (such as energy eigenfunctions). (b) solve the schr¨odinger’s equation and by using the boundary conditions of part (a) find all energy eigenfunctions, ψn(x), and the corresponding energies, en. (c) what are the allowed values of the quantum number n above? how did you decide on that? (d) what is the de broglie wavelength for the ground state? (e) sketch a plot of the lowest 3 levels’ wavefunctions (ψn(x) vs x). don’t forget to mark the positions of the walls on the graphs. (f) in a transition between the energy levels above, which transition produces the longest wavelength λ for the emitted photon? what is the corresponding wavele

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply