Answer:
8.99×10^-7m
Explanation:
The wavelength can be calculated using the expression below
E=hcλ
Where E= energy= 2.21 x 10^-19 J.
C= speed of light= 3x10^8 m/s
h= planks constant= 6.626 × 10^-34 m2 kg / s
E=hcλ
λ= E/(hc)
Substitute for the values
λ=( 2.21 x 10^-19 )/(6.626 × 10^-34 × 3x10^8 )
= 8.99×10^-7m
Work is said to be done when force moves a distance and the direction of motion is in the direction of applied force.
<h3>What is work done?</h3>
Work done is defined as the product of applied force and the distance which the applied force moves.
According to Newton's second law of motion the acceleration of a body is inversely to its mass ut directly proportional to the force and takes place in the direction of the applied force.
Therefore, work is done when force moves a distance and the direction of motion is in the direction of applied force.
Learn more about work done at: brainly.com/question/19931524
The measurement that is expressed to 3 significant figures would be C. 7.30 X 10^-7.
Answer:
The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. Therefore, the number of electrons in neutral atom of Barium is 56
Explanation:
Element Barium
Number of protons 56
Number of neutrons (typical isotopes) 134-138
Number of electrons 56
Electron configuration [Xe] 6s2