An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J) Group of answer choices 0.94 Ω 0.58 Ω 1.5 Ω 0.81 Ω 0.69 Ω

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray