The judges himself said it was the worst performance ever seen why does the author use the word themselves in the sentence

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?