When a photon hits an electron and gives it energy, what happens to the frequency of the photon after bouncing from the electron? (this occurs, and is called the compton effect.) a. the frequency increases. b. the frequency decreases. c. the frequency remains the same.

Explanation:

The Compton Effect is related to an experiment the American physicist Arthur H. Compton made, consisting in the scattering of photons from electrons, proving photons have momentum.

In additon, Compton proved that when a photon collides with a free electron, the photon loses part of its energy , which is given by the following equation:

  (1)

Where:

is the Planck constant

is the frequency of the photon

So, the energy of the photon is directly proportional to its frequency, therefore, if energy decreases in the Compton effect, the frequency decreases as well.

This also means, the photon wavelength increases (because there is an inverse relation between frequency and wavelength)

It is important to note the frequency (or wavelength) of the scattered radiation depends only on the scattering angle , which is an important element in the Compton Shift equation:

Where:  

is a constant whose value is given by , being the mass of the electron and the speed of light in vacuum.  

Hence, the correct option is B.

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-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

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hope this