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_______ is used as a moderator in nuclear reactor.

Simple water

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Radioactive elements emit positively charged particles called

Gamma ray
Cathode ray
Alpha ray
Beta ray

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Atoms are composed of

Electrons and protons
Electrons and Nuclei

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Divison of Isotopes occur because of


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Mesons are found in

Laser beams
Cosmic rays
Alpha rays
Beta ray

Mesons are hadronic subatomic particles composed of one quark and one antiquark, bound together by the strong interaction. Because mesons are composed of sub-particles, they have a physical size, with a radius roughly one femtometre, which is about 2⁄3 the size of a proton or neutron. All mesons are unstable, with the longest-lived lasting for only a few hundredths of a microsecond.

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Wavelength of visible spectrum is

3800 - 7500 angstrom
3900 - 7600 angstrom
4000 - 8000 angstrom
3500 - 7500 angstrom

The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 700 nm. In terms of frequency, this corresponds to a band in the vicinity of 430–790 THz.

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Which isotope of uranium is capable of sustaining chain reaction


Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction. It is the only fissile isotope that is a primordial nuclide or found in significant quantity in nature.

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Estination of the age of most ancient geological formations is made by

C14 method
C15 method
C12 method
C10 method

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In an atomic nucleus, what holds neutrons and protons together

Frictional forces
Spring forces
Exchange forces
Tension force

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According to Avogadro''s Hypothesis, What is name of the smallest particle of an element or a compound, that can exist independently.


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