A TV transmission tower has a height of 240 m. Signals broadcast from this tower will be received by LOS communication at a distance of (assume the radius of earth to be (6.4 x 106m)
(a) 100 km     (b) 24 km        (c) 55 km        (d) 50 km

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10 months ago

This is a Multiple Choice Questions as classified in NCERT Exemplar

Answer-b, c, d

Explanation- height of tower= 240m

For line of sight communication maximum distance would be d= 2 R h

So d= 2 * 6.4 * 10 6 * 240  = 55.4km

So distance under this are communicable

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According to question, we can write

  d = 2 h R d 2 d 1 = h 2 h 1 h 2 = ( d 2 d 1 ) 2 h 1 = ( 2 1 ) 2 × 1 2 5 = 5 0 0 m

Increment in height of tower = h2 – h1 = 500 – 125 = 375 m

Low pass filter will allow low frequency signal to pass while high pass filter allow high frequency to pass through

µ = A? /A? = 0.5 {A? = 20 volt, A? = 40 volt}
m (t) = A? sin ω? t {ω? = 2π×10? }
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Physics NCERT Exemplar Solutions Class 12th Chapter Fifteen 2025

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