An atomic bomb puts out many kinds of energy:
Heat
Light
Radio waves
Electrical
And as these energies move outward, they in turn trigger many other types of energy.
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Molatov - a gasoline fire bomb
The B-29 Bomber named The Enola Gay.
The term atomic bomb is a general one. It refers to any kind of nuclear weapon. But there are basically a couple of different types of nuclear weapon: the fission weapon, and the fusion weapon. (We can split hairs and add some, but let's not.) In a "regular" atomic or nuclear weapon, a fission weapon, subcritical masses of fissile material, usually plutonium, are driven together by conventional explosives and the thing goes off. Boom! There is fission, but no fusion. That differentiates this type of weapon from a fusion device. The term fusion deviceis used to talk about what used to be called the hydrogen bomb. The fusion weapon must have a fission device to create the heat necessary for fusion to occur, and it uses the fission bomb to "trigger" fusion in that light. If someone uses the term "fission bomb" in a presentation, they are not talking about the so-called hydrogen bomb or any fusion weapon - if they are using the term correctly.
M1 Garand was the most widespread rifle in WWII, but some were also given an M1A1 Garand. Few were given automatic rifles like the BAR and Thompson
The calviers and roundheads both had the same kind of armour. Most soldiers were given armour that covered their chests and backs. Armour was expensive and most of the time the infantry were given leather tunics instead. Although they couldn't stop gunfire, these tunics did provide some protection against swords.