The energy emitted by the Sun is primarily a result of:
A. Chemical combustion of gases.
B. Nuclear fusion of hydrogen into helium.
C. Radioactive decay of uranium.
D. Nuclear fission of heavy elements.
Answer: Option B
Solution (By JKExamLibrary)
The Sun and other stars generate their immense energy through nuclear fusion. In the Sun's core, immense gravitational pressure and heat cause hydrogen nuclei (protons) to overcome electrostatic repulsion and fuse together to form helium nuclei. This fusion process releases vast amounts of energy according to Einstein's E=mc².
Explanation:
Myopic eye focuses image in front of retina. A diverging (concave) lens spreads light so image falls on retina. Hypermetropia (farsightedness) corrected by convex lens. Bifocals for presbyopia. Cylindrical for astigmatism.
Explanation:
Scientific notation: 3.00 has three significant figures (3,0,0). Exponent part not counted. It's a clear way to show precision. 3×10⁸ has 1, 3.0×10⁸ has 2.
No comments yet. Be the first to start the discussion!