A person decorated the path in his garden with LED bulbs in three rows so that the bulbs in the first row blink at every 4 min, the bulbs in the second row blink at every 6 min and the bulbs in the third row blink at every 8 min. When will they blink together for the first time if he switches the lights on together at 6pm? *
Answers
Answer:
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Step-by-step explanation:
Light flicker refers to rapid or quick and, repeated changes in the brightness of light over time – light that appears to flutter and be unsteady. It is caused when the voltage supplied to a light source changes or when the power line voltage itself fluctuates. The severity of the flicker depends on several factors such as:
How often and regularly the voltage fluctuates.
How much of a voltage change occurs.
The kind of light – incandescent, fluorescent, LED (light emitting diodes), or HID (high intensity discharge lighting systems).
The gain factor of the lamp [gain factor is a measure of how much the light intensity changes when the voltage fluctuates – (% relative change in light levels) divided by (% relative fluctuation in voltage)].
The amount of light in the lighted area (ambient light levels).
Lamps operating on AC electric systems (alternating current) produce light flickering at a frequency of 120 Hertz (Hz, cycles per second), twice the power line frequency of 60 Hz (50 Hz in many countries outside North America). Essentially, the power is turning on and off 120 times a second (actually the voltage varies from +120 volts to -120 volts, 60 times or cycles a second and is at zero volts twice in one cycle).
Given:
The bulbs in first row glow at every 4 min.
The bulbs in second row glow at every 6 min.
The bulbs in third row glow at every 8 min.
To find:
The time at which all the three bulbs will glow together for the first time.
Step-by-step explanation:
The bulb in first row blinks at: 6:04, 08, 12, 16, 20, 24.
The bulb in the second Row blinks at:
6:06, 12, 18, 24.
The bulb in the third row blinks at:
6:08, 16, 24
The common timing in all the 3 is 6:24 pm
So the three bulbs will blink together for the first time at 6:24pm.