Physics, 22.07.2019 17:00 nengliangli523

4.a photon of green light strikes an unknown metal and an electron is emitted. the voltage is set to 2 volts. the electron cannot make the journey to the second plate. what can be said about a similar experiment done with violet light? a. an electron may or may not be emitted in the second experiment. it cannot be determined. b. an electron will be emitted in the second experiment, but it cannot be determined whether it will reach the second plate. c. an electron will be emitted in the second experiment, and it will make it to the second plate. d. an electron will not be emitted in the second experiment. 3.green light shines on an unknown piece of metal, and the lab instruments detect emitted electrons. which of the following will be true if the light is changed to violet? a. violet light will cause electrons to be emitted at greater velocities than those removed by green light. b. violet light will cause electrons to be emitted at lower velocities than those removed by green light. c. violet light will cause electrons to be emitted only if the light is as intense as the green light. d. it cannot be determined whether violet will cause electrons to be emitted or not.

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4) The correct answer is:
B. An electron will be emitted in the second experiment, but it cannot be determined whether it will reach the second plate.

In fact, violet light has higher frequency than green light. This means that photons of violet light carry more energy than photons of green light (remember that the energy of a photon is proportional to its frequency: E=hf

), so when they hit the surface of the metal, more energy is transferred to the electrons. The electron was already emitted with green light, so it must be emitted also with violet light, given the more energy transferred. The electron will also have more kinetic energy when hit by violet light, however, we cannot determine if it will reach the second plate, since we don't know how much energy has been used to extract the electron from the metal (in fact, we don't know the work function of the metal, i.e. the energy needed to extract the electron)

3) The correct answer is
A. Violet light will cause electrons to be emitted at greater velocities than those removed by green light.

In fact, violet light has higher frequency than green light. This means that photons of violet light carry more energy than photons of green light (remember that the energy of a photon is proportional to its frequency: E=hf

), so when they hit the surface of the metal, more energy is transferred to the electrons. Therefore, the emitted electrons will have on average greater energy (and so, greater velocity) than those removed by green light.

Answer from: Quest

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like $\frac{1}{3}$ . (i crazy)

most famous scientist who contributed to this physics are:

max planckalbert einsteinerwin schrödingermany

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

superposition (where 1 thing can be this and that at the same time),entanglement (where two particles are seemingly connected by some sort of unknown (or known) force, energy, matter (i know all that can be the same at least it was at the beginning)

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

Answer from: Quest

it's a b and

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4.a photon of green light strikes an unknown metal and an electron is emitted. the voltage is set to...