When I shine a green laser pointer (wavelength 532nm) on two slits, I find that what should be the central bright spot is actually a dark spot. Upon further investigation, I discover that there's a thin layer of oil covering one of the slits. The oil has an index of refraction of 1.5. What is the minimum thickness of the oil that would cause the observed effect

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

What are the similarities & differences between a thermistor and a light dependent resistor in physics?