Which are uses of lasers? check all that apply. 1.scanning a bar code on a price tag for a shirt 2.creating a magnified image of the moon 3.cutting an iron bar into two pieces 4.reshaping a cornea to improve vision 5.making a leaf appear larger so its veins are visible

1. scanning a bar code on a price tag for a shirt

3. cutting an iron bar into two pieces

4 .reshaping a cornea to improve vision

The correct answers are: (1), (3) and (4).

Explanation:

Laser: The full form of laser is "Light amplification by stimulated emission of radiation". It is a device which is used to generate an coherent monochromatic light. It is stimulated emission of the photons.

The uses of Laser are : in surgery, drilling and cutting and in reading bar codes. Laser beam is used in an eye surgery. It is used in cutting the metal.

Therefore, the following are the uses of lasers from the given options as;

Scanning a bar code on a price tag for a shirt  

Cutting an iron bar into two pieces

Reshaping a cornea to improve vision

-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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