Basic General Knowledge
To produce sound it is necessary that

the source should execute transverse vibrations
the source may execute any type of vibrations
the source should execute longitudinal vibrations
the vibrations of source are not necessary

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Basic General Knowledge
Theory of Idealism was expounded by George Hegal, Bishop George and Berkeley According to this

base of knowledge is sense-experience, that is, observations governed by scientific principles
mathli is an illusion and that the only reality that which exists mentally
good was pleasure and that evil was pain
all knowledge is derived from sensory experience, by observing and experimenting

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