Answer:
Hello your question is poorly written below is the well written question
Uranium, an important component of both nuclear weapons and nuclear reactors, has two major isotopes, U-238, which has a half-life of approximately 4.5 billion years, and U-235, which has a half-life of approximately 700 million years. Both were present in equal amounts at the time of the creation of the Earth, 4.5 billion years ago. How many years after the creation of the Earth had the amount of radiation from uranium decayed to half the amount present at the time of the creation of the Earth
Answer : 140 billion years
Explanation:
Given that :
U-238 h1/2 = 4.5 billion years
U-235 h1/2 = 700 million years
At the beginning both Isotopes where present in equal amount
Determine the T years before the amount of Uranium decays to Half
T = ? N'2 = N1 / 2
we know that N = No ( 1/2 )^h where h = time / half-life time
attached below is the detailed solution of the given problem
Different wavelength are involved.
Explanation:
If magnesium burns with a bright white flame, one can conclude that different wavelengths accompany the electron transitions for the magnesium atom.
- When an atom burns, the electrons in it are excited.
- They give out characteristic light commensurate with their energy.
- A white light is made up of different combinations of wavelength of radiations.
- When we see a white light we can infer that different joined together in the emission observed.
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Answer:
A. {K}, {Ba}, {Ca}, {Na}
B. {Au}
C. {Na}
D. Image Missing
Explanation:
PART A:
The range of wavelengths in visible region is 380 nm to 740 nm. Thus, all the elements that emit light of wavelength in this region are the elements which emit radiation in visible part. They are:
{k}
{Ba}
{Ca}
{Na}
PART B:
The energy of a photon is inversely proportional to its wavelength (E = hc/λ). Therefore, the element, which emits the radiation of smallest wavelength, has the highest energy photons. <u>That element is {Au}</u>
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PART C:
Similarly, the element which emits radiation of highest wavelength, has the lowest energy. <u>That element is {Na}</u>
PART D:
Image missing.
every color mixed together makes the color white