Now it is your turn, with some easier numbers. Your cell phone emits a signal between 0.5 and 3 watts, what is the intensity of a 1.75 watt signal 1 meter away? (this excludes Bluetooth & wifi) N=3.14159 Keep 5 decimal places in your answer, do not use scientific notation for this answer. |= Psource 1.75 watts = ? W/m? 4 × T × (1 meter)² Did you remember to square the distance?

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Now it is your turn, with some easier numbers. Your cell phone emits a signal between 0.5 and 3 watts, what is
the intensity of a 1.75 watt signal 1 meter away? (this excludes Bluetooth & wifi)
Keep 5 decimal places in your answer, do not use scientific notation for this answer.
N=3.14159
Psource
1.75 watts
= ? W/m?
4πr2
4 X T X (1 meter)²
Did you remember to square the distance?
In comparison, at Earth's equator the energy of the Sun's emission hitting Earth's surface (this is called
insolation) is about 1,000 W/m?! A 100 watt light bulb at 1 meter (if you haven't switched to an LED) nets 7.96
W/m?. Of course, there is another consideration which is wavelength and frequency, but that is a discussion for
another time.
Transcribed Image Text:Now it is your turn, with some easier numbers. Your cell phone emits a signal between 0.5 and 3 watts, what is the intensity of a 1.75 watt signal 1 meter away? (this excludes Bluetooth & wifi) Keep 5 decimal places in your answer, do not use scientific notation for this answer. N=3.14159 Psource 1.75 watts = ? W/m? 4πr2 4 X T X (1 meter)² Did you remember to square the distance? In comparison, at Earth's equator the energy of the Sun's emission hitting Earth's surface (this is called insolation) is about 1,000 W/m?! A 100 watt light bulb at 1 meter (if you haven't switched to an LED) nets 7.96 W/m?. Of course, there is another consideration which is wavelength and frequency, but that is a discussion for another time.
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