Question

19. What is the composition of biogas and the matter rich in the slurry left behind in the biogas plant?
20. With a neat diagram of a biogas plant write its construction and working?
21. Define solar constant and give its value on the
upper atmosphere and on the lower atmosphere?
22. Draw the schematic picture a solar cooker.
23. How do you classify the solar energy devices?
Explain
24. Explain the working of a solar cooker.
25. What is the role of a glass sheet and black coated
surface of a box type solar cooker?​

Answer 1

Answer:

24. Solar cooker works on the principle that sunlight warms the pot, which is used for cooking the food. Now, this warming of the pot occurs by converting light energy to heat energy. ... A solar cooker lets the UV light rays in and then transforms them into longer infrared light rays that cannot escape.