Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. Is the star moving towards or away from us, or can we not tell?

How many atoms of 0.788 moles of sodium hydroxide

A titanium cube contains 2.86*10^23 atoms. What is the edge length of the cube? The density of titanium is 4.50 g/cm^3. (The volume of a cube is V=l^3.) Express the length in centimeters to three significant figures.

The whales are responding to an stimulus

Geometry and polarity of SnCl2

Write a checklist with at least three entries for how you can evaluate whether scientific information is reliable.

Explain why a balloon filled with O2 at room temperature collapses when cooled in liquid nitrogen where as balloon filled with He does not

Which mixture can be separated by using the equipment shown below?

El agua de Mar es una mezcla homogenea o disolucion Y El agua corriente Y El aire Y LA lejia Y Los refrescos con gas Y El suero fisiologico Y Las monedas Y LA leche Y LA gelatina Y Los productos de higiene Y El merengue

The component which dissolves in a solution is called the ...

If this fossil is 65 million years old, what could this fossil suggest about organisms alive today? A. If it is similar to any two modern species, it could be a common ancestor of these species. B.