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Na+ ion is isoelectronic with:
(1) Li+
(2) Mg+2
(3) Ca+2
(4) Ba+2
Ans:(b) Mg+2
Beats: The periodic vibrations in intensity or loudness of sound because of superposition of two sound waves of similar amplitude and slightly different frequencies are known a
If the distance between the earth and moon were halved, the force of the attraction between them would be: a) One fourth as great b) One half as great c) Twice as g
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Explain the formation of diffraction pattern due to plane transmission grating. Describe the meaning of missing spectra in the diffraction pattern.
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define like and unlike parallel forces with examples
is always del U o in cyclic process
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