Physics
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?

LUV < lIR < lVIS
LUV > lVIS > lIR
LUV > lIR > lVIS
LUV < lVIS < lIR

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Physics
RADAR is used for:

receiving a signals in a radio receiver.
locating geostationary satellites.
detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.

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