Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

C) that light travels in a straight line

Explanation:

Light travels in a straight line, that is why the light travels through the cards that are arranged in a straight line but also that is why light enters a room through the window and forms angles, you can see it at dawn when light enters a room throug a window it forms an angle, it forms shadows, because light travels in a straight line.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.