The equation governing the diffusion of neutral atom is

1.	The equation governing the diffusion of neutral atom is
A.	<table><tr><td rowspan="2"></td><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> N</center></td><td rowspan="2">= D<br></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sup>2</sup>N</center></td><td rowspan="2"><br></td></tr><td align="center"> t</td><td align="center"> x<sup>2</sup></td></table>
B.	<table><tr><td rowspan="2"></td><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> N</center></td><td rowspan="2">= D<br></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sup>2</sup>N</center></td><td rowspan="2"><br></td></tr><td align="center"> x</td><td align="center"> t</td></table>
C.	<table><tr><td rowspan="2"></td><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sup>2</sup>N</center></td><td rowspan="2">= D<br></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> N</center></td><td rowspan="2"><br></td></tr><td align="center"> t<sup>2</sup></td><td align="center"> x</td></table>
D.	<table><tr><td rowspan="2"></td><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sup>2</sup>N</center></td><td rowspan="2">= D<br></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> N</center></td><td rowspan="2"><br></td></tr><td align="center"> x<sup>2</sup></td><td align="center"> t</td></table>
Answer» D. <table><tr><td rowspan="2"></td><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sup>2</sup>N</center></td><td rowspan="2">= D<br></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> N</center></td><td rowspan="2"><br></td></tr><td align="center"> x<sup>2</sup></td><td align="center"> t</td></table>

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The equation governing the diffusion of neutral atom is

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