AP EAPCET 2025 - 26th May Morning Shift | Electromagnetic Waves Question 1 | Physics

If the magnetic field in a plane progressive wave is represented by the equation $B_y=2 \times 10^{-7} \sin \left(0.5 \times 10^3 x+1.5 \pi \times 10^{11} t\right) \mathrm{T}$, then the frequency of the wave is

(In the equation time $t$ is in second)

$75 \times 10^9 \mathrm{~Hz}$

$150 \times 10^9 \mathrm{~Hz}$

$75 \times 10^7 \mathrm{~Hz}$

$150 \times 10^7 \mathrm{~Hz}$

AP EAPCET 2025 - 27th May Morning Shift

MCQ (Single Correct Answer)

-0

If $11 \%$ of the power of a 200 W bulb is converted to visible radiation, then the intensity of the light at a distance of 100 cm from the bulb is

$10.5 \mathrm{~W} \mathrm{~m}^{-2}$

$5.25 \mathrm{~W} \mathrm{~m}^{-2}$

$3.5 \mathrm{Wm}^{-2}$

$1.75 \mathrm{~W} \mathrm{~m}^{-2}$

AP EAPCET 2025 - 26th May Evening Shift

MCQ (Single Correct Answer)

-0

If a 10 W bulb emits electromagnetic waves uniformly in all directions, then the intensity of light at a distance 0.5 m from the source is nearly

$3.18 \mathrm{Wm}^{-2}$

$0.31 \mathrm{Wm}^{-2}$

$0.62 \mathrm{Wm}^{-2}$

$5 \mathrm{Wm}^{-2}$

AP EAPCET 2025 - 26th May Evening Shift

MCQ (Single Correct Answer)

-0

The layer of the atmosphere that reflects low frequency (LF) electromagnetic waves during day time only is

$D$

$E$

$F_1$

$F_2$

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