Question

2. Nishigandha kept a vessel containing all
the ingredients for making tea in a solar
cooker. Shivani kept a similar vessel on a
stove. Whose ted will be ready first and
why?​

Answer 1

answer:shivani's tea will be ready first

Explanation:

the flame produced by the stove is more higher contact with the tea than in the solar vessel. This improves the convection resulting in faster heating. Although, convergent  rays are also an efficient method of heating (convergent beam is not the case here)

Answer 2

Answer:

Shivani's tea will be prepared first.

In Shivani's case, the intensity of the flame in contact with the vessel is very high due to which the flow of heat will be faster. Thus, the time taken by the tea to reach its boiling point will be less. Hence, tea will be prepared fast.

In case of Nishigandha, the intensity of radiation reaching the vessel is not as high as compared to stove's flame. Thus, the flow of heat will be slower in this case due to which more time will be taken to reach the boiling temperature of the tea. Hence, tea will be prepared at slower rate.