JEE Main 2021 (Online) 27th July Morning Shift | Electromagnetic Waves Question 86 | Physics

A linearly polarized electromagnetic wave in vacuum is

$$E = 3.1\cos \left[ {(1.8)z - (5.4 \times {{10}^6})t} \right]\widehat iN/C$$

is incident normally on a perfectly reflecting wall at z = a. Choose the correct option

The wavelength is 5.4 m

The frequency of electromagnetic wave is 54 $$\times$$ 10⁴ Hz.

The transmitted wave will be $$3.1\cos \left[ {(1.8)z - (5.4 \times {{10}^6})t} \right]\widehat iN/C$$

The reflected wave will be $$3.1\cos \left[ {(1.8)z + (5.4 \times {{10}^6})t} \right]\widehat iN/C$$

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

-1

Intensity of sunlight is observed as 0.092 Wm^$$-$$2 at a point in free space. What will be the peak value of magnetic field at the point?

($${\varepsilon _0} = 8.85 \times {10^{ - 12}}{C^2}{N^{ - 1}}{m^{ - 2}}$$)

2.77 $$\times$$ 10^$$-$$8 T

1.96 $$\times$$ 10^$$-$$8 T

8.31 T

5.88 T

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

In an electromagnetic wave the electric field vector and magnetic field vector are given as $$\overrightarrow E = {E_0}\widehat i$$ and $$\overrightarrow B = {B_0}\widehat k$$ respectively. The direction of propagation of electromagnetic wave is along :

$$\left( {\widehat k} \right)$$

$$\widehat j$$

$$\left( { - \widehat k} \right)$$

$$\left( { - \widehat j} \right)$$

PREVIOUS NEXT

Questions Asked from Electromagnetic Waves (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates No. of Questions