The phases of the Moon are caused by the changing positions of the Earth and the Moon in relation to the Sun.

Which items could best be used to represent the Sun, the Earth, and the Moon in a model that shows the phases of the Moon?
A.
a candle, a soccer ball, and a mirror
B.
an orange, a grapefruit, and a lime
C.
a mirror, a fan, and some string
D.
a flashlight, a basketball, and a softball

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction