Typical household AC voltages peak at about 170V. Suppose your cell phone will b
ID: 1361434 • Letter: T
Question
Typical household AC voltages peak at about 170V. Suppose your cell phone will be damaged if the voltage is more than 5V. What is the ratio of the number of loops in the secondary coils to the number of loops in the primary coils for the step-down transformer that is in your cell phone charger? The radio station 1090 AM broadcasts at a frequency of 1090 kHz. What is the energy of a photon associated with this frequency? (The speed of light in air very close to the speed of light in empty space). The radio station 1090 AM broadcasts at a frequency of 1090 kHz. What is the wavelength of a photon associated with this frequency? (The speed of light in air very close to the speed of light in empty space). The radio station 1090 AM broadcasts at a frequency of 1090 kHz and a power of 50,000 Watts. What is the intensity of the signal if you are 100 miles away? The radio station 1090 AM broadcasts at a frequency of 1090 kHz and a power of 50,000 Watts. What is the amplitude of the associated electric field of the signal if you are 100 miles away?Explanation / Answer
11)v1/v2 =n1/n2
n1/n2 =170/5
but asked n2/n1 =5/170
12)energy =hv =6.6 x 10-34 x 1090 x1000 =7.914 x 10-28j
13)velocity = frequency x wavelength
wavelength = 3 x108/1090 x 1000 =275.23m
14)intensity = Power/area
100miles = 1609 x 100 =160900m
intensity =50000/160900 =0.011v/m
15)sorry i dont know that
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