The absorption values for 1 mm of pyrex at 320 nm and 280 nm are 0.15 and 1.3respectively. What are the percent transmissions for 1 mm of Pyrex at these wavelengths

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

An atom that has gained or lost electrons is called an _