Chemistry-
General
Easy
Question
If the electronic structure of oxygen atom is written as 
it would violate:
- Hund's rule
- Pauli's exclusion principle
- both Hund's and Pauli's principle’s
- none of the above
The correct answer is: Hund's rule
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Na + ion is isoelectronic with:
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Two stereo speakers are separated by a distance of 2.4 m A person stands at a distance of 3.2 m as shown directly in front of one of the speakers The frequencies in audible range for which the listener will hear a minimum sound intensity are (Speed of the sound in air is 320 ms-1 and n is order of minimum)
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is
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A source S emitting sound of frequency 300Hz is fixed on block A which is attached to the free end of a spring SA as shown in figure The dectector D fixed on block B attached to free end of spring SB detects this sound The blocks A and B are simultaneously displaced towards each other through a distance of 1.0m and then left to vibrate The maximum and minimum frequencies of sound detected by D, if the vibrational frequency of each block is 2Hz are (Velocity of sound v = 340m/s)
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A transverse wave is passing through a light string shown in the figure The equation of wave is 
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The radius of an electron orbit in a hydrogen atom is of the order of
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A nucleus of an element 
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physics-General
