A horizontal electric field causes the charged ball to hang at a 15o angle from the vertical. The ball weighs 3.0 g and carries 20 nC charge. It is hanged vertically by a non-conducting string of 60 cm length. The ball is attached to a spring which extends horizontally when the ball moves in the electric field. The spring is plastic, so it does not discharge the ball, has a spring constant 0.050 N/m, What is the electric field strength

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.