The electron in a hydrogen atom can undergo a transition from n=6 to n=1, emitting a photon with energy 2.11x10^-18j please help I'm so confused

no but i do not usually comment or use my voice that much when it comes to social media

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.