00:01
Hello students, in this question, in the first part, we need to calculate the radius of curvature of the meniscus.
00:10
We have taken it as rc.
00:14
We have been given that the contact angle, theta c equals 30 degree.
00:21
The radius of the tube, small r, is equal to 0 .5 mm.
00:27
We can calculate it in meters.
00:30
By multiplying it by 10 to the bar minus 3.
00:37
And we have been given that surface tension, we are taking it as s here, is equal to 0 .07 newton per meter.
00:52
Now we know that r divided by rc equals plus theta c.
01:00
You can see it from the triangle over here that r by r c would be equal to cos theta c it gives us r c equals r by cos theta c putting in the values we will get 0 .5 multiplied by 10 to the power minus 3 divided by cos 30 degree it means rc would be equal to 5 .1 7 .7 into 10 to the power minus 4 meters...