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January 25, 2015

January 25, 2015

Posted by **Rose** on Friday, August 19, 2011 at 2:22am.

Fidel is measuring the light intensity of a distant star. He has found that the intensity varies between a minimum of 19 units and a maximum of 75 units. At 7:00 AM today, he found the intensity was 19. The intensity then increased, reaching an intensity of 47 at 11:00 AM today.

Assume that the light intensity is a sinusoidal function of time. For what length of time today will the intensity be below 23 units?

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