The half-life of a radioactive element is the time required for:
A. Half of the atoms to decay
B. The temperature to halve
C. Complete decay
D. The mass to become zero
Answer: Option A
Solution (By JKSSB Mock Tests)
Half-life (t₁/₂) is the time taken for half of the radioactive nuclei in a sample to decay. It is constant for a given isotope and independent of initial amount (first-order kinetics). After one half-life, 50% remains; after two, 25%. It is a measure of stability. Short half-life = more radioactive.
Explanation:
According to Graham's law, the rate of diffusion is inversely proportional to the square root of molar mass. Hydrogen (H₂) has the lowest molar mass (2 g/mol) among the options (O₂=32, N₂=28, CO₂=44), so it will diffuse the fastest under identical conditions of temperature and pressure.
Explanation:
The element with atomic number 118 is Oganesson (Og). It is a synthetic element and a member of the noble gas group (Group 18). Ununennium is the temporary name for element 119, Tennessine is 117, and Nihonium is 113.
Explanation:
The Tyndall effect is the scattering of a beam of light by a medium containing small suspended particles (like colloids). The particle size must be comparable to or smaller than the wavelength of light. True solutions do not show this effect because their particles are too small to scatter light effectively.
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