The intensity of light depends on the amount of *blank blank* released and the *blank*
from the light source.

energy? or power? I'm not really sure but using the quizzes app really help with science problems

you would expect a sound wave to speed up. - b)

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west