Amoon rock collected by a u. s. apollo mission is estimated to be 3.60 billion years old by uranium/lead dating. assuming that the rock did not contain any lead when it was formed, what is the current mass of pb206 in the rock, if it currently contains 1.565 g of u238 ? the half-life of u238 is 4.47×109 years .

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

In an experiment, how can i change human errors? be specific.