A) \[2\left( \overset{\to }{\mathop{b}}\,\times \overset{\to }{\mathop{a}}\, \right)\]
B) \[-2\left( \overset{\to }{\mathop{b}}\,\times \overset{\to }{\mathop{a}}\, \right)\]
C) \[\overset{\to }{\mathop{b}}\,\times \overset{\to }{\mathop{a}}\,\]
D) \[\overset{\to }{\mathop{a}}\,\times \overset{\to }{\mathop{b}}\,\]
Correct Answer: D
Solution :
From Wien?s displacement law \[2\,\,Ml\] Where \[Ml\] is the maximum wavelength emitted and \[x\] is absolute temperature. \[y=7\,\sin \left[ 7\,\,\pi t-0.4\,\pi x+\frac{\pi }{3} \right]\] \[\frac{2\pi }{49}m/s\] \[\frac{49}{2\pi }m/s\] \[49\,\pi \,m/s\] \[17.5\,m/s\]
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