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 JKSSB Mock Tests)
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:
Buoyant force = weight of displaced fluid = ρ_fluid × V_displaced × g. Independent of depth (if fluid incompressible) and object's density, though object density determines if it floats. Shape affects volume displaced when floating.
Explanation:
Higher frequency → higher pitch. Amplitude increases loudness. Wavelength inversely proportional to frequency (v constant). So increasing frequency increases pitch.
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