Two stars that are bond together by gravity and orbit a common center of mass are known as
a. meteroids
b. constellation
c. galaxies
d. binary stars

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Talia is manufacturing rolls of wire for hanging pictures. she needs a material that is so that it can easily be pulled into wire without breaking.

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?