Solar radiation is
Options
(a) transverse electromagnetic wave (b) longitudinal electromagnetic wave (c) both longitudinal and transverse electromagnetic waves (d) none of these
Correct Answer:
transverse electromagnetic wave
Explanation:
No explanation available. Be […]
The ‘rad’ is the correct unit used to report the measurement of
Options
(a) the rate of decay of radioactive source (b) the ability of a beam of gamma ray photons to produce […]
Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr’s theory, the spectral lines emitted by hydrogen will […]
The fossil bone has a ¹⁴C:¹²C ratio, which is [1/16] of that in a living animal bone. If the half-life time of ¹⁴C is 5730 years, then the age of the fossil bone is
₉₂U²³⁴ has 92 protons and 238 nucleons. It decays by emitting an alpha particle and becomes
Options
(a) ₉₂U²³⁴ (b) ₉₀Th²³⁴ (c) ₉₂U²³⁵ (d) ₉₃Np²³⁷
Correct Answer:
₉₀Th²³⁴
Explanation:
Emission of alpha particle, decreases […]
A mixture consists of two radioactive materials A₁ and A₂ with half lives of 20s and 10s respectively. Initially the mixture has 40 g of A₁ and 160 g of A₂. The amount of the […]
Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. The other was created in a nuclear reactor 5 minutes ago. The probability […]
Curie is the unit of
Options
(a) half life period (b) decay constant (c) radioactivity (d) nuclear force
Correct Answer:
radioactivity
Explanation:
No explanation available. Be the first to write the explanation for […]
The half life of radioactive isotope ‘X’ is 50 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio of 1 : […]
A radioactive substance has a half-life of four months. Three-fourth of substance will decay in
Options
(a) 3 months (b) 4 months (c) 8 months (d) 12 months
Correct Answer:
8 months
Explanation:
Substance […]
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