What is albert einsteins contribution to the understanding of nucear energy?

He was able to prove that matter and energy are inter-convertible, and mass may be used to measure the total energy present in an object.

Explanation:

He observed a mass defect in nuclear reaction products and the reactants. Thus, mass may be used to measure the total energy present in an object by the use of the equation;

                 E = m ×

Where: E is the energy, m is the mass and c is the constant speed of light.

He developed the use of nuclear reactions to generate heat energy, which has a great applications in atomic bombs.

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.