Which of the following items are true of early nuclear science? (multiple choice) •the first nucleus split was uranium-235. •the first nuclear reactions were done in the 1880’s. •albert einstein himself caused the first nuclear reaction. •some mass of the nucleus was lost in the first nuclear reaction.

some mass of the nucleus was lost in the first nuclear reaction.

Explanation:

In a nuclear reaction, mass is converted to energy according to Einstein's equation;

E=∆mc^2 where ∆m is known as mass defect. The mass defect arises due to the conversion of part of the mass of the nucleus into energy in a nuclear reaction. c is the speed of light 3×10^8 ms^-1

By so doing, Albert Einstein confirmed that mass and energy are inter convertible in a nuclear reaction.

did you find the answer?

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.