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Let their present ages be 3x and 4x. 5 years ago, their ages were (3x - 5) and (4x - 5). (3x - 5)/(4x - 5) = 2/3. Solving, we get x = 5. Present ages = 15 and 20. Correct Option: a) 15 and 20
In order to investigate the internal atomic structure of crystals, we make use of:
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Two tuning forks produce 4 beats per second. If one has a frequency of 256 Hz, the frequency of the other is:
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