Question

arrangements must be made to store some of the energy collected by the solar cells during the day for there are two ways to do this. one is by using a battery. a charge controller helps the battery last on so, batteries do not last indefinitely, and they will eventually need to be replaced. another way to store energy for nighttime use is by tying the solar cells into the utility companys power grid. in this way it is possible to sell excess solar energy to the power company during the day and buy it back as needed during the night. some uses of solar power are efficient and save money. others are less practical and still expensive. in the future, scientists hope to make solar cells more efficient. they hope to find ways to use different chemicals and new ways of manufacturing solar cells. then everyone will be able to use solar power, the most renewable form of energy on the planet. how do solar cells work? questions 1. scientists began trying to find ways to use solar power to provide energy for everyday use in ____. a. 1883 b. the 1800s c. the 1970s d. 1790 2. solar power is used to power satellites in space. a. false b. true 3. the chemicals used in solar cells are also used in __. a. computer chips b. spaceship engines c. printers d. spaceship frames 4. solar roof panels need the protection of shade trees. a. false b. true 5. energy from solar cells can be stored for use when the sun is not shining by ____. a. both b. neither c. using a battery d. tying into the utility grid

Explanation:

Question 1

To solve this, we analyze the options. Option A is a specific year, but the text likely refers to a broader time. Option D (1790) is too early. The 1800s (B) is a broader period, and the 1970s (C) is too late for early solar power research. So the most probable is B.

Solar power is commonly used to power satellites in space as they need a reliable energy source in space, and solar cells are efficient for this. So the statement is true.

Solar cells use semiconducting materials, similar to those in computer chips. Spaceship engines (B), printers (C), and spaceship frames (D) don't use the same chemicals as solar cells. So A is correct.

Answer:

B. the 1800s

Question 2