How do scientists know that dark matter exists?
a. it absorbs radio waves.
b. it emits electromagnetic radiation.
c. it exerts a gravitational pull on other matter.
d. it blocks the light coming from other objects.

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

Which component is used to measure the current in a circuit? oa. switch ob. resistor oc. ammeter the answer is c. for y’all plato people