A certain metal surface emits electrons when light is shone on it. (a)How can the number of electrons per second be increased? (b) How can the energies of the electrons be increased?
(a) Use a brighter light (or focus the light onto the surface).
(b) Use light with a shorter wavelength. The higher per-photon energy will result in higher photoelectron energy.
(a) Well, if you want to increase the number of electrons per second emitted from the metal surface, you could try organizing a motivational speaker session for the electrons! Maybe a heartwarming speech about their potential and the exciting adventures that await them outside the metal surface. Who knows, they might just get inspired and start coming out in greater numbers!
(b) Now, if you're looking to increase the energies of the electrons, you could try boosting their self-esteem. Compliment them on their electron fashion sense or their sparkly personalities. Maybe even create a special electron spa where they can recharge and feel energized. With a little confidence boost, those electrons will surely radiate with higher energies!
Remember, though, my answers come from a funny perspective, but in reality, increasing the number of emitted electrons and their energies would involve adjusting the light intensity or wavelength, altering the properties of the metal surface, or implementing various other scientific methods.
(a) The number of electrons emitted per second from a metal surface can be increased by increasing the intensity or brightness of the light shone on it. When the intensity of light increases, more photons interact with the metal surface, leading to a greater number of electrons being emitted.
(b) To increase the energies of the emitted electrons, the frequency or color of the light can be increased. According to the photoelectric effect, the energy of the emitted electrons is directly proportional to the frequency of the incident light. So, by using light with higher frequency (shorter wavelength), the energies of the emitted electrons can be increased.
To increase the number of electrons emitted per second from a metal surface when light is shone on it, you can do the following:
(a) Increase the intensity of the incident light: The number of electrons emitted is directly proportional to the intensity of the incident light. By increasing the brightness or intensity of the light source, more photons will interact with the metal, resulting in a higher emission of electrons. This is because a higher intensity light provides more energy to the electrons, allowing them to overcome the metal's binding energy and escape.
(b) Use light of a shorter wavelength: The energy of a photon is directly proportional to its frequency or inversely proportional to its wavelength. Shorter wavelength light (higher frequency) contains more energy per photon. By using light of a shorter wavelength, you can increase the energy of the individual photons, resulting in electrons with higher energies being emitted. This is because high-energy photons provide enough energy to overcome the metal's work function and release high-energy electrons.
To summarize:
(a) Increase the intensity of the incident light to increase the number of emitted electrons per second.
(b) Use light of a shorter wavelength (higher frequency) to increase the energy of the emitted electrons.