The magnitude of the attractive force between two ions, a1+ and b1- at equilibrium is 10e-10 n. determine (a) the interionic distance, (b) the ionic radius of b1- if that for a1+ is 0.374229 nanometers, (c) the magnitude of the repulsive force between the two ions at this position, (d) the value of the coulomb's constant b and (e) the minimum potential energy of the bond. assume n = 7 in coulomb’s law

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?

True or false: the revolution of the earth creates day and night as it rotates around the sun

Positrons are spontaneously emitted from the nuclei of