The Laser is a beam of radiations which are

A Non-coherent and monochromatic
B Coherent and monochromatic
C Non-coherent and non-monochromatic
D Coherent and non-monochromatic

Correct Answer: Coherent and monochromatic

Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths. The single wavelength is called monochromatic radiation.
Bissoy MCQ
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নিচের কোন তড়িৎ-চুম্বকীয় বিকিরণের কম্পাঙ্ক সবচেয়ে কম?(which of the following electromagnetic radiations has the lowest frequency?)
A গামা (Gamma)
B অবালোহিত (Infrared)
C অতিবেগুনী (Ultraviolet)
D এক্স-রে (X-Ray)
If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?
A lUV < lIR < lVIS
B lUV > lVIS > lIR
C lUV > lIR > lVIS
D lUV < lVIS < lIR
Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?
A 200 nm and 500 nm
B 500 nm and 1000 nm
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