Which statement about gravity is false?

- every mass attracts every other mass through the force called gravity.

- the strength of gravity decreases as two objects get further away from each other.

- there is gravity on the moon.

- you can stay in one spot exactly halfway in between earth and its moon and levitate, not getting pulled by either one.

- if you were to double your mass, earth's gravity would pull you down twice as hard.

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.