Rachel noticed that the advertisement in a billboard repeats after every two minutes. What type of change she can infer here?

Physical change

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Natural change

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Periodic change

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Non-periodic change

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Solution

The correct option is C Periodic change
In the given scenario the advertisement in a billboard is repeating after a regural interval of two minutes. Such changes which repeat after regular interval of time are called periodic changes.

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Two triangular billboards are installed on a highway. Let the billboards be represented by $△$ ABC and $△$ DEF. The billboards are mechanically designed in such a way that the names of the vertices of $△$ DEF are cyclically interchanged every 1 minute, i.e. the triangles remain the same way, only the names of the vertices change. At 10 AM, for the first time the positions of the billboards are such that we can say $△$ ABC≅ $△$ DEF. After x minutes, the billboards will be in such a way, that $△$ ABC≅ $△$ DEF for the second time. Find x.