How many of following statements about the photoelectric effect are true? (a) the greater the frequency of the incident light is, the greater is the stopping potential. (b) the greater the intensity of the incident light is, the greater is the cutoff frequency. (c) the greater the work function of the target material is, the greater is the stopping potential.

(a) The greater the frequency of the incident light is, the greater is the stopping potential.

Explanation:

The stopping potential is crucial to terminate the braking of the photoemitted electrons, stopping the current completely.

Since the kinetic energy of electrons depends on the light's incidence frequency (rather than the intensity), therefore, the stopping potential is proportional to the light's incidence frequency.

The cutoff frequency, in turn, is a limiting frequency below which no  photoelectric effect occurs. The cutoff frequency depends on the material from which it is made the emitting surface (and its work function).

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.