Rank the regions of the electromagnetic spectrum according to wavelength by writ

Question

Rank the regions of the electromagnetic spectrum according to wavelength by writing the letter corresponding to the region into the appropriate blank below. A. X-rays B. Radio waves C. Infrared waves D. Visible light E. Microwaves F. Ultraviolet light G. Gamma rays Shortest Wavelength Greatest Wavelength_____ __ During class one day, we sent laser light through a tank of water. You were able to observe light from that beam which was scattered through an angle of 90 degrees as illustrated below. Explain why this scattered light is linearly polarized. Rank the power output of the following arrangements from highest power output to lowest power output.

Explanation / Answer

(5)

The correct order of regions of electromagnetic spectrum according to increasing wavelength:

Y rays, X rays, Ultraviolet rays,Visible light, Infrarred rays, Microwaves, Radiowaves

G ,A,F,D,C,E,B  ANS

(7) Light waves are transverse in nature; i.e., the electric field associated
with a propagating light wave is always at right angles to the direction of
propagation of the wave. The water tank consists of molecules aligned in a
particular direction. The electric vectors (associated with the propagating
light wave) along the direction of the aligned molecules get absorbed.
Thus, if an unpolarised light wave is incident on such a polaroid then
the light wave will get linearly polarised with the electric vector oscillating
along a direction perpendicular to the aligned molecules; hence, scattered light is linearly polarised.

(8) According to Malus’ law.

I = I0 cos2 theta
where I0 is the intensity of the polarized light after passing through Polaroid 1.

Theta is the angle between pass axis both polaroids

So,

Power outputs : PA=PB > Pc=0   ANS

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