Please answer all you can For the following 3 questions, use the formula to solve for the unknown values:
v=f∙(2L)/n, where n is an integer that represents the number of half-wavelengths.

1. The speed of a wave in a particular string is 480 m/s. Determine the frequency that will create a half-wavelength standing wave (n=1) if the length of the string is 0.8 m.

2. Determine the length of string required to produce a full wavelength standing wave (n=2) with a frequency of 250 Hz. The speed of waves in this string is 400 m/s.

3. A string with a length of 0.7 m is plucked. The speed of a wave in the string is 350 m/s. Calculate the frequency needed to create the first 3 standing waves in this string.

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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-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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