Chapter 15: Problem 2129
Which of the following electromagnetic waves has the highest frequency? (A) radiowaves (B) microwaves (C) \(\gamma\) rays (D) \(\mathrm{x}\) rays
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An observer is at \(2 \mathrm{~m}\) from an isotropic point source of light emitting \(40 \mathrm{w}\) power. The rm.s value of electric due to the source at the position of the observer is (A) \(5.77 \times 10^{-8} \mathrm{Vm}^{-1}\) (B) \(17.3 \mathrm{Vm}^{-1}\) (C) \(57.7 \times 10^{-8} \mathrm{Vm}^{-1}\) (D) \(1.73 \mathrm{Vm}^{-1}\)
In an electromagnetic wave in free space, the direction of electric field vector \(E^{-}\) is along \(y\) axis and magnetic field vector \(\mathrm{B}^{-}\) is along \(\mathrm{z}\) axis then which of the following is true (A) $\left(\mathrm{E}^{-} \times \mathrm{B}^{-}\right) \times \mathrm{E}^{-}=1$ (B) $\left(\mathrm{E}^{-} \times \mathrm{B}^{-}\right) \times \mathrm{B}^{-}=1$ (C) $\left(\mathrm{E}^{-} \times \mathrm{B}^{-}\right) \times \mathrm{B}^{-}=0$ (D) none of these
In an electromagnetic wave, if the amplitude of magnetic field is $3 \times 10^{-10} \mathrm{~T}$, the amplitude of the associated electric field will be (A) \(9 \times 10^{-2} \overline{\mathrm{Vm}^{-1}}\) (B) \(3 \times 10^{-10} \mathrm{Vm}^{-1}\) (C) \(3 \times 10^{-2} \mathrm{Vm}^{-1}\) (D) \(1 \times 10^{-18} \mathrm{Vm}^{-1}\)
The oscillating electric and magnetic field vectors of an electromagnetic waves far away from source are oriented along (A) Mutually perpendicular direction and differ in phase by \(90^{\circ}\) (B) Mutually perpendicular and in same phase (C) In same direction and in same phase (D) In same direction and differ in phase by \(90^{\circ}\)
The sun delivers \(10^{3} \mathrm{Wm}^{-2}\) of electromagnetic flux to earth's surface. The total power that is incident on a roof of dimension $8 \mathrm{~m} \times 20 \mathrm{~m}$ will be (A) \(4 \times 10^{5} \mathrm{w}\) (B) \(2.56 \times 10^{4} \mathrm{w}\) (C) \(6.4 \times 10^{5} \mathrm{w}\) (D) \(1.6 \times 10^{5} \mathrm{w}\)
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