Cathode ray - a beam of electrons emitted from the cathode of a high-vacuum tube.
Beta particle - A beta particle, sometimes called beta ray <span>is a high-energy, high-speed electron or positron emitted in the radioactive decay of an atomic nucleus.
It is a subatomic particle indeed with given mass and charge.
So the answer is 4. a Gamma ray
Gamma ray - </span>Gamma rays (also called gamma radiation)<span> are penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei. It consists of photons in the highest observed range of photon energy.</span>
The correct answer is b. an element
The explanation:
when the ELEMENT is define as substance that cannot be decomposed (broken down) into simpler substances by ordinary chemical means. Examples: gold, iron, carbon, hydrogen, oxygen, nitrogen
Ex: diamond will be broken into carbon as well.
and SUBSTANCE: Material composed of only one kind of matter throughout (same atoms or same molecules).
Answer:
0.238 M
Explanation:
A 17.00 mL sample of the dilute solution was found to contain 0.220 M ClO₃⁻(aq). The concentration is an intensive property, so the concentration in the 52.00 mL is also 0.220 M ClO₃⁻(aq). We can find the initial concentration of ClO₃⁻ using the dilution rule.
C₁.V₁ = C₂.V₂
C₁ × 24.00 mL = 0.220 M × 52.00 mL
C₁ = 0.477 M
The concentration of Pb(ClO₃)₂ is:
![\frac{0.477molClO_{3}^{-} }{L} \times \frac{1molPb(ClO_{3})_{2}}{2molClO_{3}^{-}} =0.238M](https://tex.z-dn.net/?f=%5Cfrac%7B0.477molClO_%7B3%7D%5E%7B-%7D%20%7D%7BL%7D%20%5Ctimes%20%5Cfrac%7B1molPb%28ClO_%7B3%7D%29_%7B2%7D%7D%7B2molClO_%7B3%7D%5E%7B-%7D%7D%20%3D0.238M)
Answer:
All distances are measured from pole of the mirror
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