Why are the five tons of boys dropped on Hiroshima so powerful?

If you know the name of the bomb and don't know its nature, please see the explanation upstairs.

Of course, the damage caused by the little boy is indeed much greater than that caused by the fat man later, mainly for several reasons:

1, the bomber Williams is extremely accurate. According to the observation of the great artist of the accompanying observation machine, it is said that the error is within 40 meters;

2. Hiroshima has a gentle terrain, and the shock wave suitable for this big guy spreads rapidly;

It was morning, and every family in Japan was cooking breakfast. Because all the houses in Japan are made of wood, and every house has a stove, it caught fire soon after the explosion.

4. Hiroshima was not bombed during the whole World War II, and residents generally had a weak awareness of air raid prevention. When the little boy came down, there were three parachutes at the same time. One was a little boy and the other two were observation equipment. So people thought that American pilots had been shot and parachuted, and they all ran out to watch.