A thin vertical flat plate of height L, and infinite width perpendicular to the plane of the figure, is losing heat t o t he sur r oundi ngs by nat ur al convection. The temperature of the plate and the surroundings, and the proper ties of t he surrounding fluid, are constant. The relationship bet ween t he average Nussel t and Rayl ei gh numbers is given as Nu = K Ra
1/4, where K is a constant. The lengt h scales for Nusselt and Rayleigh numbers are the height of the plate. The height of the plate is increased to 16L keeping all other factors constant
![](http://images.interviewmania.com/wp-content/uploads/2019/10/18q-2.png)
If the average heat transfer coefficient for the first plate is h
1 and that for the second plate is h
2, the value of the ratio h
1 /h
2 is