19. Life Cycle of Stars

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1. which statement is false about sun ? 1) sun has Hydrogen up for 72% of the mass . 2) sun has helium is 26%. 3) Surface temperature of sun is 5800 K . 4) Radius of sun is 69570 km.

2. how much time required sunrays to reachat earth from sun . 1) 8 minutes 2) 18 minutes 3) 28 minutes 4) 81 minutes