BCECE Medical BCECE Medical Solved Papers-2004

If \[{{\lambda }_{v}},{{\lambda }_{x}}\] and \[{{\lambda }_{m}}\] represent the wavelengths of visible light, X-rays and microwaves respectively, then :

A) \[{{\lambda }_{m}}>{{\lambda }_{x}}>{{\lambda }_{v}}\]

B) \[{{\lambda }_{v}}>{{\lambda }_{m}}>{{\lambda }_{x}}\]

C) \[{{\lambda }_{m}}>{{\lambda }_{v}}>{{\lambda }_{x}}\]

D) \[{{\lambda }_{v}}>{{\lambda }_{x}}>{{\lambda }_{m}}\]

Correct Answer: C

Solution :

Wavelength order of given rays are listed below :

Rays	Wavelength \[(\overset{o}{\mathop{A}}\,)\]
Visible light	4000-7900
X-rays	1 - 100
Microwaves	\[{{10}^{7}}-{{10}^{9}}\]
Obviously,	\[{{\lambda }_{x}}<{{\lambda }_{v}}<{{\lambda }_{m}}\]
or	\[{{\lambda }_{m}}>{{\lambda }_{v}}>{{\lambda }_{x}}\]