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Question: Ratio of masses of proton to electron is nearly: A. \(1.8\) B. \(1.8 \times {10^{ + 3}}\) C. I...

Ratio of masses of proton to electron is nearly:
A. 1.81.8
B. 1.8×10+31.8 \times {10^{ + 3}}
C. Infinite
D. None of these

Explanation

Solution

An electron is a fundamental particle with a negative charge and a mass of 9.11×10−28g9.11 \times {10^{ - 28}}g , while a proton has a mass of 1.67×10−24g1.67 \times {10^{ - 24}}g and is a fundamental particle with a positive charge

Complete step by step answer:
We shall understand more about protons and electrons. We must understand that an atom is electrically neutral, we can assume that it has an equivalent amount of negative and positive charge. The presence of protons in an atom gives it a positive charge.As a result, we can define a proton as a fundamental particle with a unit positive charge.A proton has a charge of 1.6×10−19C1.6 \times {10^{ - 19}}C and a mass of 1.67×10−24g1.67 \times {10^{ - 24}}g.

Anode rays were used to discover protons. As a high voltage is applied between the electrodes, it was discovered that certain rays from the anode's side travel through the holes in the cathode and emit green fluorescence. Anode rays, canal rays, and positive rays were all terms used to describe these rays (because of the presence of positive atoms).The interaction of electrons causes the atom's negative component, so we can assume that an electron is a fundamental particle with one-unit negative charge.

An electron has a charge of 1.6×10−19C1.6 \times {10^{ - 19}}Cand a mass of 9.11×10−28g9.11 \times {10^{ - 28}}g. Cathode rays were used to discover electrons. When huge voltage was applied between the electrodes, rays from the cathode were seen passing through the hole of the anode, which had a faint greenish hue. These rays are known as cathode rays, because they have a negative charge (due to the presence of electrons).The ratio of mass of proton to the mass of electron is:
1.6×10−249.11×10−28=1835\dfrac{{1.6 \times {{10}^{ - 24}}}}{{9.11 \times {{10}^{ - 28}}}} = 1835
This can also be written as: 1.8×10+31.8 \times {10^{ + 3}}

Hence, the correct answer is option B.

Note: The anode rays and the cathode rays both travel in a straight line. By dividing the charge by the charge by mass ratio, the mass of both particles was calculated:
m=e(em)m = \dfrac{e}{{\left( {\dfrac{e}{m}} \right)}}
A proton's charge by mass ratio is 9.58×10∘Cg−19.58 \times {10^ \circ }C{g^{ - 1}} , while an electron's is 1.76×10∘Cg−11.76 \times {10^ \circ }C{g^{ - 1}}.