The spectrum of the sun has hundreds of strong lines of nonionized iron but only a few, very weak lines of helium. a star of spectral type b has very strong lines of helium but very weak iron lines. do these differences mean that the sun contains more iron and less helium than the b star? explain.

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

Slab pull” is a type of tectonic plate movement that occurs due to the forces of mantle convection and results in the subduction of the lithosphere true or false