Which statement is incorrect?

1.	Speed of light in free space \(=\frac{1}{\sqrt{\mu_0 \epsilon_0}}\)
2.	Speed of light in the medium \(=\frac{1}{\sqrt{\mu \epsilon}}\)
3.	\(\frac{E_0}{B_0}=c\)
4.	\(\frac{B_0}{E_0}=c\)

Displacement current is:

A radiowave has a maximum magnetic field induction of ${10}^{-4}$ T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is

(1) zero

(2) $3\times {10}^4 V/m$

(3) $5.8\times {10}^{-9} V/m$

(4) $3.3\times {10}^{13 } V/m$

The shortest wavelength is for 

(1) $\gamma$-rays

(2) X-rays

(3) ultraviolet rays

(4) microwaves

An accelerated charge :

(1) emits an electromagnetic wave

(2) does not emit electromagnetic wave

(3) produces a gravitational field

(4) None of these

The electromagnetic radiations are in descending order of wavelength in the following sequences :

(1) infra-red waves, radio waves, X-rays, visible light rays

(2) Radio-waves, infra-red waves, visible light rays, X-rays

(3) Radio waves, visible light rays, infra-red waves, X-rays

(4) X-rays, visible light rays, infra-red wave, radio-waves

X-rays and $\gamma$-rays are both electromagnetic waves, which one of the following statements is true?

(1) in general, X-rays have a larger wavelength than that of $\gamma$-rays

(2) X-rays have a smaller wavelength than that of $\gamma$-rays

(3) $\gamma$-rays have smaller frequency than that of X-rays

(4) wavelength and frequency of X-rays are both larger than those of $\gamma$-rays.

Which of the following are not electromagnetic waves?

(1) cosmic rays

(2) gamma rays

(3) microwaves

(4) X-rays

The frequencies of X-rays, $\gamma$-rays and ultraviolet rays are respectively a, b and c. Then :

(1) a < b, b < c

(2) a > b, b > c

(3) a > b, b > a

(4) a < b, b > c