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MODUL • Fizik TINGKATAN 5

Dengan prinsip keabadian tenaga, bagi setiap elektron, tenaga keupayaan elektrik = tenaga kinetik
From the principle of conservation of energy, for each electron, electrical potential energy = kinetic energy
1
eV = mv 2
2

Oleh itu, Hence, v = 2eV
m

v = halaju elektron / velocity of the electrons
V = beza keupayaan antara anod dan katod / potential difference between anode and cathode
e = cas setiap elektron / charge of one electron, 1.6 × 10 C
–19
m = jisim elektron / mass of electron, 9 × 10 kg
–31

Faktor Kesan ke atas kadar pancaran termion
Factor Effect on the rate of thermionic emission
Suhu katod Apabila suhu meningkat, maka kadar pancaran termion juga meningkat.
Temperature of the cathode The rate of thermionic emission increases as the temperature increases.

Luas permukaan katod Jika luas permukaan bertambah, kadar pancaran termion juga akan meningkat.
Surface area of the cathode The rate of thermionic emission increases as the surface area increases .

Beza keupayaan antara anod Jika beza keupayaan meningkat, kadar pancaran termion tidak berubah tetapi halaju elektron yang
dan katod dipancarkan ke arah anod meningkat.
Potential difference between the If the potential difference increases, the rate of thermionic emission is unchanged but the velocity of the
anode and cathode emitted electrons towards the anode increases.
UNIT 4

UNIT 4
Jenis pergerakan sinar katod dalam tiub sinar katod
Types of motion of cathode rays in a cathode ray tube

P Q
Kawasan / Region Jenis gerakan / Types of motion
PQ: Katod ke anod

R Pecutan seragam / Uniform acceleration
Cathode to anode
QR: Anod ke skrin

Anode to screen Halaju seragam / Uniform velocity

Perubahan tenaga pada elektron dalam sinar katod
Energy conversion of electrons in cathode rays

Kawasan / Region Jenis tenaga / Types of energy

Tenaga keupayaan elektrik
P: Katod / Cathode

Electric potential energy
PQR: Katod ke anod dan skrin Tenaga keupayaan elektrik Tenaga kinetik

Cathode to anode and screen Electric potential energy Kinetic energy

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