Define nuclear fusion
What will be an ideal response?
Nuclear fusion is the combining of lighter elements to forum heavier elements, with the release of energy. Four hydrogen atoms fuse into one helium atom. All main sequence stars are in the process of fusing hydrogen into helium.
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Vision Problems: A nearsighted person wears contact lenses having a power of -0.15 diopters. What is the person's uncorrected far point?
A. 1.5 m B. 3.3 m C. 6.0 m D. 6.7 m
Which of the following is a contribution that Eratosthenes made to astronomy?
A. He determined the circumference of Earth. B. He was the first person known to have pointed a telescope at the sky. C. He discovered his Three Laws (of Planetary Motion). D. He discovered epicycles.
Based on current scientific evidence, the theory that has been most successful at explaining the origin of life on Earth is
A) naturism B) panspermia C) intelligent design D) chemical evolution
A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units). If the speed of the helium nucleus is 1.8 × 10^6 m/s, what is the speed of the thorium nucleus?
a. 1.0 × 10^4 m/s c. 3.6 × 10^4 m/s b. 3.1 × 10^4 m/s d. 4.1 × 10^4 m/s