Which statement is true about the speed of waves in the electromagnetic spectrum?

a) the speed of all electromagnetic wave is inversely proportional to their wavelength.
b) the speed of all electromagnetic waves is directly proportional to their frequency.
c) in a vacuum, all electromagnetic waves travel at speeds between 1.098 x10^5 and 2.998 x 10^8 m/s.
d) in a vacuum, all electromagnetic waves travel at the peed of 2.998 x 10^8 m/s.

Water at room temperature of 20.0°c is poured into an aluminum cylinder which has graduation markings etched on the inside. the reading in the graduations is 300.0 cc. the cylinder with the water in it is then immersed in a constant temperature bath at a temperature of 100°c. what is the reading for the level of water on the graduations of the cylinder after the water and the cylinder reach thermal equilibrium with the bath? the volume coefficient of expansion of water is 2.07 x 10^-4 k-1, and the linear coefficient of expansion of aluminum is 23.0 x 10^-6 k-1. a) 305.0 cc b) 304.0 cc c) 303.5 cc d) 303.3 cc e) 304.5 cc

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?