Which of the following best describes the forces that generate solar power? energy of the sun strikes photovoltaic cells producing a flow of electrons. heat energy beneath the earth's surface heats underground water into steam. heat energy is released during nuclear fission and steam is produced to turn a turbine. heat from the earth’s core and pressure transform the remains of dead plants and animals.

The correct answer is the energy of the Sun striking photovoltaic cells producing a flow of electrons.

Explanation:

The radiation from the Sun coming in contact with the photovoltaic cells generating a flow of electrons describes the forces, which produce solar power.  

The heat energy underneath the surface of the Earth, which heats underground water into steam is an illustration of geothermal energy.  

Heat energy discharged at the time of nuclear fission and the generation of steam taking place to start a turbine is an illustration of nuclear power.  

The heat from the core of the Earth and pressure transforming the remnants of dead animals and plants is an illustration of generation of fossil fuels.  

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.