Methods used to determine the specific heat capacity of aluminium may give a value greater than the actual value. explain why

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Which object is most likely represented by a dot?

Determine the maximum r-value of the polar equation r =3+3 cos 0