Electromagnetic...

If the wavelength of red light in air is $$7500$$ $$\overset{o}{A}$$, then the frequency of light in air is ___________.

Which of the following conclusion can be drawn from the result $$\oint \bar{B}\cdot d\bar{A}=0$$

An electromagnetic wave going through vacuum is described by $$E=E_0\sin{(kx-\omega t)}$$; $$B=B_0\sin{(kx-\omega t)}$$. 
Which of the following equation is true?

Which of the following effects could not be explained by Maxwell's electromagnetic wave theory?

A parallel plate capacitor is charged to $$60 \mu C$$. Due to a radioactive source, the plate loses charge at the rate of $$1.8\times 10^{-8}C/s$$. The magnitude of displacement current is:

Assertion: Dipole oscillations produce electromagentic waves, 
Reason : Accelerated charge produces electromagnetic waves

The electric field of an electromagnetic wave in free space is given by $$\vec E = 10cos (10^7 t + kx) \widehat{j } V/m,$$ where t and x are in seconds and metres respectively. It canbe inferred that
(a) The wavelength $$\lambda$$ is 188.4 m
(b) The wave number k is 0.33 rad/m
(c) The wave amplitude is 10 V/m
(d) The wave is propagating along +$$x$$ direction
Which one of the following pairs of statements is correct?

The pressure exerted by an electromagnetic wave of intensity $$\displaystyle I\left( { watt }/{ { m }^{ 2 } } \right) $$  on a non-reflecting surface is : [c is the velocity of light] 

According to the electromagnetic wave theory, light consists of electric and magnetic fields which are __________.

The electric field for an electromagnetic wave in free space is $$\vec{E}=\vec{i}30\cos(kz-5\times 10^8t)$$, where magnitude of $$\vec E$$ is in $$V/m$$. The magnitude of wave vector, $$k$$ is: