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_______ is used as a moderator in nuclear reactor.

Simple water

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Atoms are composed of

Electrons and protons
Electrons and Nuclei

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Enormous energy is released during atomic explosion because of

Conversion of electrons into protons
Conversion of chemicals into gases
Conversion of mass into energy
Conversion of neutrons into protons

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The order of the wavekength of X rays is

1 micron
1 angstrom
1 cm
1 mm

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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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What is the reason behind the dark lines in the solar spectrum

Absorption of corresponding wavelengths by the inner layers of the sun
Absorption of corresponding wavelengths by the outer layers of the sun
Absence of corresponding wavelengths by the inner layers of the sun
Destructive interference between waves of certain definite wavelengths

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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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Who proved that ''No two electrons in an atom can have the same set of four quantum numbers''


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