Answer:
The metal surface becomes more positive as electrons are lost from it.
Explanation:
Let us note that photoelectric effect refers to a phenomenon in which electrons are ejected from a clean metal surface irradiated with light of appropriate frequency. This photon must possess a frequency above the threshold frequency of the metal and its energy must exceed the work function of the metal. When these conditions are met, electrons are emitted from a clean metal surface, having a constant kinetic energy as long as the frequency of the incident photon remains constant.
However, as photoelectric effect progresses and electrons are lost from the metal surface, the metal surface becomes more positive. The more positive the surface, the greater the attraction of the positive surface for the emitted electrons. This reduces the kinetic energy of the emitted photons even though the frequency of incident photons is held constant.
Fill in the blank
The (blank) of a rock is a result of its mineral composition.
Answer:
Color
Answer:
A
Explanation:
The earth's rotation makes stars appear to move during the night.
Answer:
0.625 kg
Explanation:
Since 90.6 is 3 half-lives from 30.2 (90.6/30.2 = 3) , divide the initial mass of the sample by 2, and divide that quotient by 2, and divide THAT quotient by 2 to determine how much remains after 3 half-lives.
Answer is: acid.
An acid<span> is a </span>molecule<span> or </span>ion<span> capable of donating </span>proton or hydrogen ion H⁺.
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity <span>an </span>aqueous solution<span>.
</span>pH number of <span>lemon juice (citric acid) and vinegar (acetic acid CH</span>₃COOH) is below seven (pH<span><7). For bases pH is greater than seven.</span>