State which of the following statements are true and which are false: a) After two half-lives, all radioactive nuclei in a substance will have decayed.
Nuclear Fusion
Nuclear fusion is a type of nuclear reaction. In nuclear fusion, two or more than two lighter atomic nuclei combine to form a heavier nucleus. During this process, an enormous amount of energy is released. This energy is called nuclear energy. Nuclear fusion is the energy source of the sun and stars.
Fusion Bomb
A fusion bomb is also known as a thermonuclear bomb or hydrogen bomb which releases a large amount of explosive energy during a nuclear chain reaction when the lighter nuclei in it, combine to form heavier nuclei, and a large amount of radiation is released. It is an uncontrolled, self-sustaining nuclear chain reaction where isotopes of hydrogen combine under very high temperature to form helium. They work on the principle of operation of atomic fusion. The isotopes of Hydrogen are deuterium and tritium, where they combine their masses and have greater mass than the product nuclei, get heated at high temperatures, and releases energy.
State which of the following statements are true and which are false:
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a) After two half-lives, all radioactive nuclei in a substance will have decayed.
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b) A resistor R and a capacitor C connected in parallel combine as 1 = 1 + 1RC R C
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c) A photon travels along multiple paths from a star to a Geiger counter.
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d) The brighter the light illuminating a photocathode, the higher the energy of the electrons
emitted.
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e) When a photon travels from a star to your eye, in its frame of reference the duration of its journey and the distance travelled are both zero.
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