Compare radio waves and ultraviolet light

Both radio waves and ultraviolet light are part of the electromagnetic spectrum. The main differences are due to the different wavelength and frequency of the two types of waves. In fact:

- Radio waves are the electromagnetic waves with longest wavelength (> 1 mm) and lowest frequency (<300 GHz). Since they can travel very long distance, they are generally used in radiocommunications, satellites, broadcasting, radar, etc.. (long-distance applications)

- Ultraviolet light includes electromagnetic waves with much shorter wavelength than radio waves (10-400 nm) and as a consequence much higher frequency. As a result, ultraviolet light also has much more energy than radio waves (because the energy of an electromagnetic wave is directly proportional to its frequency). Ultraviolet light is contained, for example, in the sunlight. Its effect can be dangerous for human skin, causing cancers if the skin is exposed to them for a long time.

-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

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what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.