00:01
So here's right answer for first and here we can write about now.
00:05
Here we can write a cube equal to 1 over 1 .6 multiply width 10 to the power 22 right centimeter cube.
00:24
Okay so now okay so here we can write a cube equal to a cube equal to of also write 0 .06, sorry, 0 .625, not 0 .625, not 0 .625 multiply with 10 to the power minus 201 okay, centimeter cube, right? so also, right, right, a equal to we can write here, 0 .3 97 multiply with 10 to the power 7 minus 7 centimeter.
01:28
Is it clear? so now, e equal to we can write 3 .97 multiply with 10 to the power minus 8 cm.
01:43
Right? so this is the answer for first.
01:50
So now we will move for second.
01:54
So now here we can say the 1 1 planes in bcc unit cell.
02:23
So therefore we have highest atomic density density and the hundred plane have the atomic density, right? so, as we know, plane density is equal to number of atom over area of plane.
03:19
Number of atom over area plane equal to, we can write here what density, right? so, okay, here we can write now.
03:37
So this is the formula for this plain density.
03:43
Plain density.
03:47
So now move further.
03:51
First, third.
03:55
So for bc, sorry, fcc.
03:59
For fcc, okay.
04:03
Both 1 and 2.
04:09
1 and 2.
04:11
Question, a equal to 3.
04:17
Point, 97 multiply 10 to the power minus 8 cm.
04:29
In this also the 1 comma 1 and 1 plane in fcc, right, unit cell have, unit cell have highest atomic density, right? and 100 plane in fcc unit cell equal to lowest atomic density.
05:28
Right? is it clear? so now we talk about fourth section.
05:37
So bcc and fcc...