An electron in the hydrogen atom makes a transition from an energy state of principal quantum numbers n i
to the n =2 state. If the photon emitted has a wavelength of 434
nm, what is the value of n i
?

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .