What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction?
a. number of protons and electrons
b. the number of protons and neutrons
c. the number of electrons only
d. the number of neutrons and electrons

when earth is in rotational motion around the sun,it displaces from its place.

when a ball is placed on an inclined surface it does both the rotational and circular motion.

explanation:

wavelength divides in half and speed stays the same.

snell's law

refractve index = sin incidence / sin refraction

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.