Why can caesium be used in photoelectric cell while lithium cannot ?

Why can caesium be used in photoelectric cell while lithium cannot ?
by

1 Answer

Answer :

Ans. Caesium has the lowest while lithium has the highest ionization enthalpy. Hence Cs can lose electrons very easily while lithium cannot.
by

Related questions

Why are potassium and caesium, rather than lithium used in photoelectric cells ?

Description : Why are potassium and caesium, rather than lithium used in photoelectric cells ?

Last Answer : Ans. Potassium and caesium have much lower ionization enthalpy than that of lithium. As a result, these metals on exposure to light, easily emit electrons but lithium does not. Therefore, K and Cs rather than Li are used in photoelectric cells

Which of the following alkali metals has highest specific heat? (1) Caesium (2) Rubidium (3) Potassium (4) Lithium

Description : Which of the following alkali metals has highest specific heat? (1) Caesium (2) Rubidium (3) Potassium (4) Lithium

Last Answer : Lithium

The two elements that exist as liquids at 25°C are (a) Mercury and lithium (b) Mercury and caesium (c) Bromine and mercury (d) Mercury and argon

Description : The two elements that exist as liquids at 25°C are (a) Mercury and lithium (b) Mercury and caesium (c) Bromine and mercury (d) Mercury and argon

Last Answer : Ans:(c)

An atomic clock is based on transitions in - (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium

Description : An atomic clock is based on transitions in - (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium

Last Answer : (2) Caesium Explanation: An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms ... the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.

The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium

Description : The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium

Last Answer : (2) Silicon Explanation: A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic ... silicon, polycrystalline silicon, amorphous silicon, cadmium telluride, and copper iridium selenide/sulfide.

The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium

Description : The material used in solar cells contains (1) Tin (2) Silicon (3) Caesium (4) Thallium

Last Answer : Silicon

An atomic clock is based on transitions in (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium

Description : An atomic clock is based on transitions in (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium

Last Answer : Caesium

What is the chemical equation for caesium plus water?

Description : What is the chemical equation for caesium plus water?

Last Answer : Feel Free to Answer

The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium

Description : The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium

Last Answer : D) Gallium and caesium

Which metal among the following melts below 30^0 C. a) copper b)aluminium c)gold d)caesium

Description : Which metal among the following melts below 30^0 C. a) copper b)aluminium c)gold d)caesium

Last Answer : d)caesium

What are the advantages and disadvantages of LED storage cell and lithium ion batteries ?

Description : What are the advantages and disadvantages of LED storage cell and lithium ion batteries ?

Last Answer : Although both cells are rechargeable, lithium ion batteries have higher recharge efficiency. Due to this its use as an alternative to commercial led storage cell is increasing. Light Li / C anode and ... LiOH and H2, gases that are dangerous. LIB costs more than Ni-Cd rechargeable batteries .

A photoelectric cell converts – (1) Mechanical energy to electric energy (2) Heat energy to mechanical energy (3) Light energy to chemical energy (4) Light energy to electrical energy

Description : A photoelectric cell converts – (1) Mechanical energy to electric energy (2) Heat energy to mechanical energy (3) Light energy to chemical energy (4) Light energy to electrical energy

Last Answer : (4) Light energy to electrical energy Explanation: Photoelectric cell or photocell, device whose electrical characteristics (e.g., current, voltage, or resistance) vary when light is incident ... The most common type consists of two electrodes separated by a light-sensitive semiconductor material.

Photoelectric cell converts

Description : Photoelectric cell converts

Last Answer : Light energy into Electric energy.

Give four applications of photoelectric cell.

Description : Give four applications of photoelectric cell. 

Last Answer : i) It is used in Lux-meter ii)It is used for automatic control of traffic signals iii)It is used to switch on and off automatically the street lights. iv)It is used in recording and reproduction of ... shooting of film. v)It is used in television sets, fire alarms vi)It is used in Exposure meter.

Explain the construction and working of a photoelectric cell with a neat diagram.

Description : Explain the construction and working of a photoelectric cell with a neat diagram. 

Last Answer : Construction: 1. It consists of evacuated glass bulb having cathode (K) and anode (A). 2. The semi cylindrical cathode coated with photosensitive material from inner side. 3. The ... are attracted by anode. The photoelectric current flows through the circuit &millimeter shows the deflection.

Why are Cs and K used as electrodes in photoelectric cells?

Description : Why are Cs and K used as electrodes in photoelectric cells? 

Last Answer : The alkali metal atoms have the largest sizes in a particular period of the periodic table. With This property makes caesium and potassium useful as electrodes in photoelectric cells.

Which of the following scientists explained the photoelectric effect? Was it: w) Einstein x) Planck y) Bohr z) Chadwick

Description : Which of the following scientists explained the photoelectric effect? Was it: w) Einstein x) Planck y) Bohr z) Chadwick

Last Answer : ANSWER: W -- EINSTEIN

Lithium floats an water while sodium floats and catches fire when put in water.

Description : Lithium floats an water while sodium floats and catches fire when put in water.

Last Answer : Explain : Lithium floats an water while sodium floats and catches fire when put in water.

a. Which atom should have smaller ionization enthalpy, oxygen or sulfur? b. The lithium forms +1 ions while berylium forms +2 ions ?

Description : a. Which atom should have smaller ionization enthalpy, oxygen or sulfur? b. The lithium forms +1 ions while berylium forms +2 ions ?

Last Answer : With the help of diagram answer the questions given below : a. Which atom should have smaller ... forms +1 ions while berylium forms +2 ions ?

Monitoring plasma drug concentration is useful while using: A. Antihypertensive drugs B. Levodopa C. Lithium carbonate D. MAO inhibitors

Description : Monitoring plasma drug concentration is useful while using: A. Antihypertensive drugs B. Levodopa C. Lithium carbonate D. MAO inhibitors

Last Answer : C. Lithium carbonate

Monitoring plasma drug concentration is useful while using: A. Antihypertensive drugs B. Levodopa C. Lithium carbonate D. MAO inhibitors

Description : Monitoring plasma drug concentration is useful while using: A. Antihypertensive drugs B. Levodopa C. Lithium carbonate D. MAO inhibitors

Last Answer : C. Lithium carbonate

What is the physical condition of lithium ?

Description : What is the physical condition of lithium ?

Last Answer : Silver white metal.

What is the solubility of lithium ?

Description : What is the solubility of lithium ?

Last Answer : Lithium has one.

What is the boiling point of lithium ?

Description : What is the boiling point of lithium ?

Last Answer : Lithium has a boiling point of 1340 degrees Celsius.

What is the melting point of lithium ?

Description : What is the melting point of lithium ?

Last Answer : Lithium has a melting point of 179 degrees Celsius.

What is the relative atomic mass of lithium ?

Description : What is the relative atomic mass of lithium ?

Last Answer : The relative atomic mass of lithium is seven.

What is Lithium Ion Battery ( LIB) ?

Description : What is Lithium Ion Battery ( LIB) ?

Last Answer : Lithium-ion battery ( LIB) is a rechargeable battery. In this the Li + ion is transferred from the anode to the cathode during discharge and the same Li + ion from the cathode to the ... added ( Li +) graphite rod anode. Nowadays, its efficiency in applying nanotechnology has been greatly enhanced.

What is the symbol of lithium ?

Description : What is the symbol of lithium ?

Last Answer : Lithium symbolizes Li

What is the sign of lithium ?

Description : What is the sign of lithium ?

Last Answer : : Likhiam's signal Li.

The element with highest first ionization energy is - (1) hydrogen (2) helium (3) lithium (4) sodium

Description : The element with highest first ionization energy is - (1) hydrogen (2) helium (3) lithium (4) sodium

Last Answer : (2) helium Explanation: The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of ... ) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.

Which one of the following metals does not react with water to produce Hydrogen? (1) Cadmium (2) Lithium (3) Potassium (4) Sodium

Description : Which one of the following metals does not react with water to produce Hydrogen? (1) Cadmium (2) Lithium (3) Potassium (4) Sodium

Last Answer : (1) Cadmium Explanation: A cadmium metal does not react with water to produce Hydrogen.

Which one of the following is the softest (1) sodium (2) iron (3) aluminium (4) lithium

Description : Which one of the following is the softest (1) sodium (2) iron (3) aluminium (4) lithium

Last Answer : (1) sodium Explanation: lightest-lithium, heaviestosmium, hardest-tungsten, soft metal- sodium.

Which of the following metal has the lowest melting point? (1) Lead (2) Lithium (3) Potassium (4) Sodium

Description : Which of the following metal has the lowest melting point? (1) Lead (2) Lithium (3) Potassium (4) Sodium

Last Answer : (3) Potassium Explanation: Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.

Which one of the following elements exhibits the greatest tendency to lose electrons? (1) Fluorine (2) Lithium (3) Oxygen (4) Zine

Description : Which one of the following elements exhibits the greatest tendency to lose electrons? (1) Fluorine (2) Lithium (3) Oxygen (4) Zine

Last Answer : (2) Lithium Explanation: Alkali metals such as Lithium are the most electropositive elements in the periodic table. As alkali metals have low ionization energies, they have a great tendency to lose electrons forming unipositive ions.

Which one of the following metals does not react with water to produce Hydrogen ? (1) Potassium (2) Cadmium (3) Sodium (4) Lithium

Description : Which one of the following metals does not react with water to produce Hydrogen ? (1) Potassium (2) Cadmium (3) Sodium (4) Lithium

Last Answer : (2) Cadmium Explanation: Cadmium is a soft, malleable, ductile, bluish-white divalent metal. It is similar in many respects to zinc but forms complex compounds. Unlike other metals, cadmium is ... occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production.

How do you account for the strong reducing power of lithium in aqueous solution?

Description : How do you account for the strong reducing power of lithium in aqueous solution?

Last Answer : Ans.Electrode potential is a measure of the tendency of an element to lose electrons in the aq.solution .It depends upon following factors : (i)Sublimation enthalpy. (II)Ionisation enthalpy (iii) ... hydration.Thus Li has the most negative E0 Value and hence lithium is the strongest reducing agent.

In what ways lithium shows similarities to magnesium in its chemical behavior?

Description : In what ways lithium shows similarities to magnesium in its chemical behavior?

Last Answer : Ans. (a) the hydroxides of both lithium and Mg decompose on heating (b) Both form ionic nitrides when heated in an atmosphere of nitrogen. (C) The carbonates of both Li and Mg decompose on heating

Name the chief factor responsible for the anomalous behavior of lithium.

Description : Name the chief factor responsible for the anomalous behavior of lithium.

Last Answer : Ans. High polarizing power (charge/size ratio).

Mention the Points of Similarities between ‘Lithium and Magnesium’

Description : Mention the Points of Similarities between ‘Lithium and Magnesium’  

Last Answer :  The similarity between lithium and magnesium is particularly striking and arises because of their similar sizes : (atomic radii, Li = 152 pm, Mg = 160 pm; ionic radii : Li+ = 76 ... Both LiCl and MgCl2 are deliquescent and crystallise from aqueous solution as hydrates, LiCl·2H2O and MgCl2·8H2O.  

Mention the Points of Difference between ‘Lithium and other Alkali Metals’

Description : Mention the Points of Difference between ‘Lithium and other Alkali Metals’

Last Answer : (i) Lithium is much harder. Its m.p. and b.p. are higher than the other alkali metals. (ii) Lithium is least reactive but the strongest reducing agent among all the alkali metals. ... and Li2O are comparatively much less soluble in water than the corresponding compounds of other alkali metals. 

Lithium and beryllium, shows similarity with which elements .

Description : Lithium and beryllium, shows similarity with which elements . 

Last Answer : Lithium shows similarities to magnesium and beryllium to aluminium in many of their properties. This type of diagonal similarity is commonly referred to as diagonal relationship in the periodic table. 

What is the formula for Lithium Peroxide?

Description : What is the formula for Lithium Peroxide?  

Last Answer : ANSWER: Li2O2

Which of the following elements has the highest electronegativity? w) Lithium x) Iodine y) Cesium z) Oxygen

Description : Which of the following elements has the highest electronegativity? w) Lithium x) Iodine y) Cesium z) Oxygen

Last Answer : ANSWER: D -- OXYGEN

The element used in treating manic depression is: w) sulfur x) nitrogen y) calcium z) lithium

Description : The element used in treating manic depression is: w) sulfur x) nitrogen y) calcium z) lithium

Last Answer : ANSWER: Z -- LITHIUM 

In a flame test both lithium and strontium produce various shades of this color. What is this color?

Description : In a flame test both lithium and strontium produce various shades of this color. What is this color?

Last Answer : ANSWER: RED

Which one of the following elements exhibits the greatest tendency to lose electrons ? (1) Fluorine (2) Lithium (3) Oxygen (4) Zinc

Description : Which one of the following elements exhibits the greatest tendency to lose electrons ? (1) Fluorine (2) Lithium (3) Oxygen (4) Zinc

Last Answer : Lithium

The element with highest first ionisation energy is (1) hydrogen (2) helium (3) lithium (4) sodium

Description : The element with highest first ionisation energy is (1) hydrogen (2) helium (3) lithium (4) sodium

Last Answer : helium

Which one of the following metals does not react with water to produce Hydrogen ? (1) Potassium (2) Cadmium (3) Sodium (4) Lithium

Description : Which one of the following metals does not react with water to produce Hydrogen ? (1) Potassium (2) Cadmium (3) Sodium (4) Lithium

Last Answer : Cadmium

What is the photoelectric effect?

Description : What is the photoelectric effect?

Last Answer : The photoelectric effect is the phenomenon by which electrons are emitted from a material when it absorbs electromagnetic radiation, such as light, and is an important concept in physics and quantum mechanics.

What is the photoelectric effect?

Description : What is the photoelectric effect?

Last Answer : The photoelectric effect is a phenomenon in which electrons are emitted from a material when it is exposed to electromagnetic radiation, such as light, and was one of the key pieces of evidence supporting the theory of quantum mechanics.