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
A hydrogen balloon floats up because of

Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight
The pressure inside the balloon is more than the pressure outside it

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