NEET Physics Waves Questions Solved

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NEET - 2008

Two periodic waves of intensities  pass through a region at the same time in the same direction. The sum of the maximum and  minimum intensities is

(a) ${I}_{1}+{I}_{2}$

(b) ${\left(\sqrt{{I}_{1}}+\sqrt{{I}_{2}}\right)}^{2}$

(c)${\left(\sqrt{{I}_{1}}-\sqrt{{I}_{2}}\right)}^{2}$

(d)

Resultant intensity of two periodic waves is given by

where $\delta$ is the phase differences between the waves.

for maximum intensity,

Therefore, for zero order maxima, cos $\delta =1$

${I}_{max}={I}_{1}+{I}_{2}+2\sqrt{{I}_{1}{I}_{2}}={\left(\sqrt{{I}_{1}}+\sqrt{{I}_{2}}\right)}^{2}$

for minimum intensity ,

n=1,2,.....etc

Therefore, for Ist order minma, cos $\delta =-1$

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