Generate Quiz 688DB71F6C61A

The half-life T is equal to 2.7 days. T= 233280 s, half life of 24 hours, 3600 seconds

mass m = 1 mg = 10-3g
Mass of an atom = 198 g/mol
What is activity A?
activity A = λN
λ is the decay constant.
It is determined using the provided formula.
T1/2 = 0.693/λ is the relationship between the decay constant and the half-life, T1/2.
λ is equal to 0.693T.
λ = 0.693233280s
The number of atoms, N, is determined by the formula N=[mass/atomic mass]; λ =2.9 10-6s-1According to Avogadros, N = [10-3g/198g/mol]6.022 x 10^(23)N = 3.03 x 10^18
Now, we will find the activity A activity A =λN
A = [2.9 10-6s-1] during activity[3.03 x 10^18]
activity A = 8.8x 10^12 disintegrations/second or 8.8x 10^12 Bq
1 Ci = 3.7x 10^10 Bq for Curie
Hence, A= 8.8x 10^12 / 3.7x 10^10 A= 240 Ci

Dense materials are effective at absorbing radiation, including x-rays. It takes a lot of energy to knock off their electrons, and they have big electronic clouds. As a result, these materials absorb the radiation from x-rays rather than being ionized. Because lead is so dense, it makes an excellent choice for x-ray absorbers among the materials listed.

Because they contain an equal number of positively charged protons and negatively charged electrons, atoms are electrically neutral. They balance each other out. Because of the charged particles, the atom is electrically neutral.

An element’s isotopes differ in the number of neutrons they contain, but they all have the same number of protons and electrons. As a result, the mass number or atomic mass would differ while the atomic number would remain the same.

The atomic number determines an atom’s chemical characteristics. The valence electrons that determine a substance’s chemical properties can be obtained from its atomic number.

This is the right choice. Space-time geometry is the right response (c). Our understanding of gravity was drastically changed by Einstein’s theory of relativity, both special and general. General relativity states that gravity is a curvature of space-time brought on by the presence of mass and energy rather than a force. According to this theory, the curvature of space-time affects how objects move, producing the effects that we see as gravity.

The wavelength of an X-ray falls between 10−11 and 10−8 meters.

Hazardous waste that contains radioactive material is known as radioactive waste.

It is produced by nuclear power plants, laboratories, hospitals, and other establishments.

Almost all waste is managed and contained to ensure that it doesn’t emit harmful radiation; however, some obviously require permanent and deep burial.

Radioactive wastes are not used.

D is therefore the right choice.

Half of the sample decays with each half-life; three half-lives is equal to ⅞ of the sample. The sample halved every time it went from 1 to ½ to ¼ to ⅛, so 3×80 = 240s

The following formula can be used to determine the energy difference between two levels:

ΔE = hc/λ

where λ is the wavelength, c is the speed of light, and h is Planck’s constant.

Changing the specified values:

ΔE = (6.626 x 10-34 J s) x (3.0 x 108 m/s) / (1.337 x 10-10 m)

ΔE is equal to 1.49 x 10-15 J.

Energy conversion to keV:

ΔE = (1.49 x 10-15 J) / (1.602 x 10-19 J/keV) = 9.31 keV

Therefore, E) 9.31 keV is the right response.

Since radiation can radiate without a physical medium, this choice is accurate. Electromagnetic waves are how these radiate. For instance, heat does not require a medium to travel because it radiates from the sun in space to the earth as electromagnetic waves.

Given that fermions have a half-integral spin, option B is accurate. Electrons, neutrons, and “protons” are examples of fermions.

Isotopes are those elements that have a different mass number but the same atomic number.

Z + 1, A: According to this option, the electron is released from the electron cloud, changing the nucleus’s atomic number (Z) but leaving its mass number (A) unchanged. Since the number of protons and neutrons in the nucleus is unaffected by the emission of an electron, this choice is accurate.

The phenomenon known as the photoelectric effect can only be explained by taking into account that light is a particle. When light is viewed as discrete energy packets (photons), the photoelectric effect is essentially the result of photons and electrons interacting in a material to produce electron emission. Since option D clearly illustrates the particle nature of light, it is the best option.

Option B is accurate since “beta rays” are made up of beta particles, which are essentially the same as electrons in that they have negligible mass and a negative charge equivalent to one “proton.”

A neutron is 1836 times heavier than an electron. We can state that the electron-to-neutron mass ratio is 1836:1. As a result, none of the choices are accurate.