Powerful tropical storms that are characterized by wind speeds greater than 120 km/h and storm surges are called

a.
tornadoes.
b.
hurricanes.
c.
thunderstorms.
d.
hailstorms.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

What are the necessary conditions for fusion?

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?