The photeselestric effect is observed when light of a sufficiently high frequency is focused onto a polished metal surface, emitting photo electrons with a kinetic energy that is given by the difference betweent he photon enerzy and the work function of the metal historically, this effect was very confusing. for most wave phenon tand ight was wel known to behave as a wave phenomenon·ore nerease the increasing the amplitude of the wave. in the case of light, this means increase- there are simple more electrons emitted increasing the ententisty. however, with increased intensity, the kinetic energy of the photoelections emited does not albert einstein (1879-1955) offered a solution to this perplecing problem in hi 190s einen die erzeugung und verwandlung des lichtes betrefflenden heuristischen gesichtspunkr. einstein proposed the following relationship: kinetic- hw-e work function energy of an emitted photoelectron, hw is the energy of a photon of frequency v and ework function is the wrok function for the metal used in the ion is the energy required to remove an electron from the surface of the metal experiment. the work functi references einstein, albert (1905). the work function of cesium is 2.1 ev. what is this energy in? hint: 1 ev-1,602 x 10-19) annalen der physik 17(6 132-148 (1905) 34x 1019) 21x 1019 64x 1019 43x 1019 19, 0 19, 0

Explanation:

In order to convert the work function of cesium from electronvolts to Joules, we must use the following conversion factor:

In our problem, the work function of cesium is

so, we can convert it into Joules by using the following proportion:

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this