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Sound and light waves both have ___________ .
Heat stored in water vapour is –
Which of the following is the time taken for one complete oscillation of a sound wave in the density of the medium?
Quantum Theory was discovered by
Which compound is used to prepare water proof clothes?
What characteristic makes metals good conductors of electricity?
1 unit of Newton is equal to
Which medium cannot propagate sound waves?
Which material has the lowest refractive index?
In the atmosphere ultraviolet rays are absorbed by –