Describe the method of energy production in the Sun. What is the fuel? What is the end product? What kind of interactions occur? What is the role of temperature in the process? Could we use this process to produce energy on Earth?
What will be an ideal response?
The Sun produces energy by fusing hydrogen into helium. In net, four hydrogen nuclei fuse to produce one helium nucleus, two neutrinos, and energy. The temperature required is very high (at least 10 million K—the Sun's core is 15 million K). Research is underway to develop a controllable similar process to generate energy on Earth.
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The brakes in a car work because of __________ principle
Fill in the blank(s) with correct word
The photoreceptors responsible for "twilight" vision are called
a. rods. b. cylinders. c. cones. d. cans.
If elements A and B chemically bond to each other more strongly than a random mixture of A and B elements chemically bond, it is expected that a _____________ of A and B should form.
Fill in the blank(s) with the appropriate word(s).
When a person stands 40 cm in front of a cosmetic (concave) spherical mirror, the upright image is twice the size of the object. What is the focal length of the mirror?
A) 27 cm B) 40 cm C) 80 cm D) 160 cm