Question 20 7.5 pts Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving O At 1/8 the speed as the hydrogen molecules O At 1/16 the speed as the hydrogen molecules O At the same speed as the hydrogen molecules O At 1/4 the speed as the hydrogen molecules Previous NextD Question 21 7.5 pts Increasing the wavelengths in a double-slit experiment has what effect on the position of maxima (bright spots) on a screen at fixed distance? O Maxima get cancelled by minima. Maxima get closer together. Maxima pass minima on the screen. O Maxima get farther apart. Previous NextD Question 22 7.5 pts There are equal concentrations of single-charged positive and negative ions (te and -e) on either side of a cell membrane, but the outside of the membrane has higher concentrations than the inside of the membrane. If the membrane allows only positive ions to diffuse across it, what will happen? O A net negative charge will build up outside the cell, and the high concentration side of the membrane will be at a higher electric potential. O A net negative charge will build up outside the cell, and the low concentration side of the membrane will be at a higher electric potential. O A net negative charge will build up inside the cell, and the high concentration side of the membrane will be at a higher electric potential. O A net negative charge will build up inside the cell, and the low concentration side of the membrane will be at a higher electric potential