<span>Cell membranes are selectively permeable because it allows some things to enter or leave the cell while keeping other things outside or inside the cell.</span>
High-frequency sound waves have a shorter wavelength and a higher pitch than low-frequency sound waves.
Answer:
D) Significantly more energy is required to vaporize water because the intermolecular forces between molecules are being completely broken.
Explanation:
Different states of matter differ because of intermolecular distance between them . Molecules are closest in solid state and farthest in gaseous state . To separate them energy is needed . When matter changes state from liquid to gas , the distance between the molecule increases enormously . Hence energy requirement too is large . When matter changes state from solid to liquid , their mutual separation does not increase much so energy requirement too is lesser. Moreover there is tremendous increase in their volume in gaseous state due to which gas has to do work against external pressure which requires much energy.
