Assume a bulb of efficiency \(2.5\%\) as a point source. The peak values of the electric field and magnetic field produced by the radiation coming from a \(100~\text{W}\) bulb at a distance of \(3~\text{m}\) are respectively:
1. | \( 2.5 ~\text{V/m}, ~2.2 \times 10^{-8} ~\text{T} \) |
2. | \( 3.6 ~\text{V/m}, ~ 3.6 ~\text{T} \) |
3. | \( 4.07~\text{V/m},~ 1.4 \times 10^{-8} ~\text{T}\) |
4. | \( 4.2 ~\text{V/m}, ~3.4 \times 10^{-6}~\text{T}\) |
1. | \( 2.16~\text{cm}, 24.1~\text{GHz} \) | 2. | \( 0.29~\text{cm}, 13.7~\text{GHz} \) |
3. | \( 3.23 ~\text{cm}, 20.0~\text{GHz} \) | 4. | \( 1.26~\text{cm}, 23.9~\text{GHz}\) |
1. | cannot be less than 1. |
2. | equals 1, always. |
3. | cannot be greater than 1. |
4. | can be any non-zero value. |
1. | \(300~\text{T}\) | 2. | \(10^{-6}~\text{T}\) |
3. | \(9 \times 10^{10}~\text{T}\) | 4. | \(300\sqrt {2}~\text{T}\) |