ENTRANCE TEST – 2012 | Multiple Questions and Answers

6.	Laser light is monochromatic which means

	A.	It consists of one ray of light
	B.	It consists of one wavelength
	C.	It consists of carbon monoxide gas
	D.	It consists of photons having 1 eV energy

7.	If an electron in the ‘K’ shell is removed and an electron from ‘L’ shell jumps to occupy the hole in the ‘K’ shell, it emits a photon of energy:

	A.	hfKα = EL – EK
	B.	hc = EL – EK
	C.	h/λKα = EL – EK
	D.	hfKα = EK – EL

8.	Which of the following property must be there in a substance so that it can be used as target in X-ray tube?

	A.	It must have low melting point
	B.	It must have low atomic number
	C.	It must have high reflecting ability
	D.	It must have high atomic number

9.	Which of the following can be used to produce population inversion for the emission of Laser?

	A.	Optical pumping
	B.	Optical fibre
	C.	Optical instrument
	D.	Optical polarization