JEE Main 2013 (Offline) | Electromagnetic Waves Question 131 | Physics

An electromagnetic wave in vacuum has the electric and magnetic field $$\mathop E\limits^ \to $$and $$\mathop B\limits^ \to $$, which are always perpendicular to each other. The direction of polarization is given by $$\mathop X\limits^ \to $$ and that of wave propagation by $$\mathop k\limits^ \to $$. Then

$$\mathop X\limits^ \to ||\mathop B\limits^ \to $$ and $$\mathop X\limits^ \to ||\mathop B\limits^ \to \times \mathop E\limits^ \to $$

$$\mathop X\limits^ \to ||\mathop E\limits^ \to $$ and $$\mathop k\limits^ \to ||\mathop E\limits^ \to \times \mathop B\limits^ \to $$

$$\mathop X\limits^ \to ||\mathop B\limits^ \to $$ and $$\mathop k\limits^ \to ||\mathop E\limits^ \to \times \mathop B\limits^ \to $$

$$\mathop X\limits^ \to ||\mathop E\limits^ \to $$ and $$\mathop k\limits^ \to ||\mathop B\limits^ \to \times \mathop E\limits^ \to $$

AIEEE 2006

MCQ (Single Correct Answer)

-1

The $$rms$$ value of the electric field of the light coming from the Sun is $$720$$ $$N/C.$$ The average total energy density of the electromagnetic wave is

$$4.58 \times {10^{ - 6}}\,J/{m^3}$$

$$6.37 \times {10^{ - 9}}\,J/{m^3}$$

$$81.35 \times {10^{ - 12}}\,J/{m^3}$$

$$3.3 \times {10^{ - 3}}\,J/{m^3}$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

An electromagnetic wave of frequency $$v=3.0$$ $$MHz$$ passes from vacuum into a dielectric medium with permittivity $$ \in = 4.0.$$ Then

wave length is halved and frequency remains unchanged

wave length is doubled and the frequency becomes half

wave length is doubled and the frequency remains unchanged

wave length and frequency both remain unchanged.