Question

1. The speed of electromagnetic waves

   		Depends on the wavelength in a vacuum
   		Depends on the photon energy
   		Is the same as the speed of sounds
   		Is the same for all waves regardless of wavelength

2. Vertically polarized light with an intensity of 1000 mW/m² is coming toward you. After passing through a polarizing filter that is tilted 45 degrees relative to horizontal, what is the wave’s intensity?

		707 mW/m2
		500 mW/m2
		333 mW/m2
		250 mW/m2
		0 mW/m2

Answer 1

1,

Speed of a EM wave on a medium is given by,

If wavelength increases, the frequency decreases and viceversa; to the velocity in vaccum a constant.

So it doesnot depend on the wavelength in vacuum

Photon Energy is given by, h is a constant ( Planck's Constant )

So it doesnot depend on the photon energy

Speed of sound = 343 m/s . So it is not equal to speed of sound

So it is same for all waves regardless of wavelength ==> Option D is Correct

2,

According to Malu's Law, the intensity of a beam of plane-polarized light after passing through a polarizer varies as the square of the cosine of the angle polarizer between plane of polarisation,

here, Initial intensity, and

Option B