40 points! i will give brainliest if right

the electromagnetic spectrum includes all electromagnetic waves, from radio waves with long wavelengths and low frequencies to gamma rays with short wavelengths and high frequencies. which statement best describes how fast these waves travel in a vacuum?
a) infrared waves travel faster than ultraviolet wave
b) high-frequency waves travel somewhat faster than low-frequency waves
c) all electromagnetic waves travel at the same speed.
d)gamma rays travel much faster than others because they have the highest frequencies

In an oxidation-reduction reaction, oxidation is what happens when a reactant

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.