Answer:
4g of the radioactive element present
Explanation:
Radioactive elements are atoms that are unstable in normal conditions and are converted in another different atoms.
1 half life express the time that is need to decay the half of the initial amount of the radioactive element.
If initially we have 8g of the radioactive element, after 1 life we will have 8g/2 =
4g of the radioactive element present
Answer: The answers are the first and third options.
Answer:
The wavelength of these photons will become longer. The energy of each of these photons will become lower.
Explanation:
<h3>Wavelength</h3>
Light can be considered as electromagnetic waves. The wavelength of a wave is equal to the minimum distance between two troughs (lowest points) in this wave. On the other hand, the frequency of a wave is equal to the number of wavelengths that this wave travels in unit time.
Assume that the speed of light stays the same. The distance that this beam of light travels in unit time will be the same. However, with a lower frequency, there would be fewer wavelengths in that same distance. Therefore, the size of each wavelength will become longer.
If represent the speed of light and represents the frequency, then the wavelength would be:
.
<h3>Energy</h3>
The energy of each proton of a beam of light is proportional to the frequency of the light. Let denote Planck's Constant. The numerical relation between and would be:
.
Therefore, if the frequency of this light becomes smaller, the energy of each of its proton will also become proportionally lower.
14 as well. A neutral atom has just as many protons in its nucleus and electrons it is electronic shells.