Answer:
last one.Condution and convection are equzlly efficentmethods of heat transfer.
Explanation:
No, one more group must get the same result as the other group. This will make it more reliable and reproducible.
To solve this problem we will apply the concepts related to destructive interference from double-slit experiments. For this purpose we will define the path difference as,

Here,
= Wavelength
= Angle when occurs the interference point of destructive interference
Our values are given as,


Using the previous expression we have,





Therefore the distance between the two openings is 