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Task 1

The document discusses the effect of electric fields on subatomic particles. It states that particles with smaller mass to charge ratios are deflected more in electric fields. Positively charged particles are deflected toward the negative plate, while negatively charged particles move toward the positive plate. The angle of deflection is inversely proportional to the particle's mass to charge ratio - particles with lower mass or higher charge will have larger deflection angles. Examples and diagrams are provided to illustrate these principles for beams of various ions passing through an electric field.

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Cherry T CY
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513 views3 pages

Task 1

The document discusses the effect of electric fields on subatomic particles. It states that particles with smaller mass to charge ratios are deflected more in electric fields. Positively charged particles are deflected toward the negative plate, while negatively charged particles move toward the positive plate. The angle of deflection is inversely proportional to the particle's mass to charge ratio - particles with lower mass or higher charge will have larger deflection angles. Examples and diagrams are provided to illustrate these principles for beams of various ions passing through an electric field.

Uploaded by

Cherry T CY
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Chapter 1

Topic : Effect of an electric field on subatomic particles.

Practice :

𝑚𝑎𝑠𝑠
--- ions deflected more with smaller ratio
𝑐ℎ𝑎𝑟𝑔𝑒
--- same charge smaller masses,
--- same mass, higher charge

Angle of deflection is inversely proportional to the


𝑚𝑎𝑠𝑠
.
𝑐ℎ𝑎𝑟𝑔𝑒
Electric field on subatomic particles

1.

(i) Name the subatomic Y. _________


(ii) Draw the paths of the beam of electrons and hydrogen ions in above diagram
(iii) If a beam of deuterium ions is passed through the electric field. State the difference in
deflection beam of hydrogen ions and that of deuterium ions.

(iv) Describe the path of independent beam of hydrogen atoms in the electric field.

2. A beam of hydrogen ions , hydride ions and helium atoms are passed into an electric
field as shown in the diagram below. Complete the table below.

Types of particle Relative charge Relative mass Angle of deflection


Hydrogen ion
Hydride ion
Helium atom

TANG- 2018 Page 1


Reinforcement practices:

1. A beam of 1H+ and 16O- ions is passed into an electric field. Draw the electric field and
show the path for beam of 1H+ and 16O- ion. Explain the size of the angles of deflections for
the beam of 1H+ and 16O- ions.

Answer:

2.

Compare alpha and beta particle.


4 0
2𝐻𝑒 −1𝑒

Compare positive ions


𝑚𝑎𝑠𝑠
Low or high 𝑐ℎ𝑎𝑟𝑔𝑒

3. Draw and explain for example

a) 1H+ , 2H+ and 3H+ b) 79Br+ , 81


Br+ and 3Br2+

TANG- 2018 Page 2


Answer:

1. i. neutron

ii.
iii. the angles of deflection of deuterium ions is half of that of hydrogen ions.
iv. hydrogen atoms are not deflect in electric field.
2
Types of particle Relative charge Relative mass Angle of deflection
Hydrogen ion +1 1 Alpha
Hydride ion -1 1 beta
Helium atom 0 4 Not deflect as it is neutral

Reinforcement practices
1. Angles for beam of 1H+ ion bigger than beam of
16 -
O ion because the 16O- ion is heavier than the
beam of 1H+ ion.

2. 42𝐻𝑒 deflected to negative plate, and 0


−1𝑒 to positive plate.

𝑚𝑎𝑠𝑠
3. Angle of deflection is inversely proportional to the 𝑐ℎ𝑎𝑟𝑔𝑒
1
H+ > 2H+ > 3H+
79 +
Br > 81Br+ > 3Br2+

TANG- 2018 Page 3

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