In a double-slit experiment, the slits are illuminated by a monochromatic, coherent light source having a wavelength of 599 nm. An interference pattern is observed on the screen. The distance between the screen and the double-slit is 1.69 m and the distance between the two slits is 0.114 mm. A light wave propogates from each slit to the screen. What is the path length difference between the distance traveled by the waves for the seventh-order maximum (bright fringe) on the screen

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Well it depends on the object or substance