Light shines through a single slit whose width is 5.7 × 10-4 m. a diffraction pattern is formed on a flat screen located 4.0 m away. the distance between the middle of the central bright fringe and the first dark fringe is 4.2 mm. what is the wavelength of the light?

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c