Does photoelectric current depend on frequency?
Photoelectric effect can be explained as: it takes a specific energy to launch an electron from a metal surface. This energy is the work function which relies upon the metal. Electrons can pick up energy by collaborating with photons. Current is not dependent on the frequency of photons.
What is photoelectric effect formula?
In his explanation of the photoelectric effect, Einstein defined a quantized unit or quantum of EM energy, which we now call a photon, with an energy proportional to the frequency of EM radiation. In equation form, the photon energyis E = hf, where E is the energy of a photon of frequency f and h is Planck’s constant.
Which metal are suitable for photoelectric effect and why?
Alkali metals
Which metal has highest work function?
platinum
What type of metal shows photoelectric effect?
alkali metals
Which is the best material for photoelectric emission why?
Semiconductors like silicon, cadmium telluride, gallium arsenide and copper indium diselenide are the best material for photoelectric emission. Generally, for the photoelectric effect, materials with low work function are used so that electrons can be emitted from the material by a photon of very low energy.
Do all metals show photoelectric effect?
Experimental observation of photoelectric emission. Even though photoemission can occur from any material, it is most readily observed from metals and other conductors.
Which alkali metal is strongest reducing agent?
Lithium
Which metal is strongest reducing agent?
lithium
Which alkali metal is the weakest reducing agent?
Li
How do you identify a reducing agent?
Identify the oxidizing and reducing agents. Step 1: Plan the problem. Break the reaction down into a net ionic equation and then into half-reactions. The substance that loses electrons is being oxidized and is the reducing agent.
Which is the poorest reducing agent?
Dihydrogen
Which is strongest reducing agent nascent hydrogen?
Nascent hydrogen is most powerful reducing agent than ordinary hydrogen because nascent hydrogen is in atomic state and atoms are more active than molecules, nascent hydrogen is evolved in small bubbles containing the gas under great pressure, nascent hydrogen is activated by the energy liberated in the reaction in …
Why alkali metals are strong reducing agents?
They can attain the noble gas electronic configuration by the removal of one electron which is a stable configuration. Due to low ionization potential and having the smallest nuclear charge they can easily lose an electron. Hence, alkali metals are considered as a powerful reducing agent.
Which of the following is the weakest reducing agent atomic hydrogen?
Thus hydrogen has least tendency to donate electron and is the weakest reducing agent.
Which is the strongest reducing agent in halogens?
Fluorine
Is Al a weak reducing agent?
Reducing agents are typically electropositive elements such as hydrogen, lithium, sodium, iron, and aluminum, which lose electrons in redox reactions. Similarly, all species in Table 1 that lie above H2 are stronger reductants than H2, and those that lie below H2 are weaker.
Which of the following metal is a weakest reducing agent?
Cu is the weakest reducing agent as it comes after H in electrochemical series.
Why is na weakest reducing agent?
Sodium has the largest positive oxidation enthalpy, which means that its oxidation will be less likely to happen according to its Gibbs free energy.
Can H2O2 act as a reducing agent?
H2O2 can be reduced to H2O as well as it can be oxidised to O2. Hence, it can act as an oxidizing agent by itself getting reduced to H2O as well as it can act as a reducing agenct by getting oxidized to O2. Therefore, it can act as oxidizing as well as reducing agent. Was this answer helpful?
Why is sodium the least powerful reducing agent?
Sodium has the lowest hydration enthalpy than others in alkali metals and hence sodium is the weakest reducing agent among alkali metals. because in alkali group it has the highest electronegativity.