Page 128 - Softcopy for Teachers buku kerja + nota Nilam Publications

MODUL • Fizik TINGKATAN 5

Mengkaji ciri-ciri sinar katod
To investigate the characteristics of cathode rays

Ciri-ciri sinar katod dikaji dengan menggunakan tiub palang Maltese dan tiub pesongan.
The characteristics of cathode rays are investigated by using the Maltese cross tube and deflection tube.

Tiub palang Maltese Palang Maltese aluminium
Maltese cross tube Bekalan Aluminium Maltese cross
pemanas, 6V
6 V Katod Anod
heater supply Cathode Anode Vakum
Vacuum
Bayang
Shadow

Skrin berpendarfluor
3 kV Fluorescent screen

Prosedur Pemerhatian Penerangan Kesimpulan
Procedure Observation Explanation Conclusion

Pemanas 6 V Bayang palang kelihatan. Bayang dihasilkan oleh Lintasan sinar bergerak dalam
dihidupkan. A shadow of the cross is cahaya dari filamen yang garis lurus
A 6 V heater is seen. dipanaskan. .
switched on. The shadow is formed by the Light rays travel in a straight line .
light rays from the heated
filament.

Sekarang bekalan Bayang palang berwarna Bayang palang dihasilkan Sinar katod bergerak dalam garis lurus.
kuasa 3 kV hijau kelihatan. Ia sama oleh sinar katod. Sinar katod menyebabkan
disambungkan saiz dan sama kedudukan The shadow is formed by the kesan berpendarfluor
antara katod dan dengan bayang yang cathode rays. .
anod. dihasilkan oleh cahaya Sinar katod membawa tenaga kinetik yang UNIT 4
Now, a 3 kV power tadi. ditukarkan kepada tenaga cahaya apabila
UNIT 4
supply is connected A green shadow of the ia menghentam skrin.
between the cathode cross is seen. It is the Cathode rays travel in a straight line.
and anode. same size and at the same
position as the shadow Cathode rays cause fluorescence .
formed by the light earlier. Cathode rays carry kinetic energy which is
converted to light energy when they hit
the screen.

Kutub utara Bayang sinar katod Daya saling tindakan / Daya Sinar katod boleh dipesongkan oleh
magnet bar dibawa bergerak dan terpesong lastik dihasilkan kerana sinar medan magnet
berdekatan dengan ke bawah. katod membawa cas negatif. . Peraturan tangan kiri
sinar katod The cathode ray shadow A catapult force is produced Fleming digunakan untuk menentukan arah
The North pole of a is moved and deflected because the cathode rays gerakan sinar.
bar magnet is brought downward. carry a negative charge. Cathode rays can be deflected by a
close to the cathode magnetic field . The Fleming’s left-hand
rays. rule is used to determine the direction of motion.

Perhatian / Note:
N Arah sinar katod adalah bertentangan dengan
S arah arus. / The direction of the cathode rays is
opposite to that of the electric current.

129 © Nilam Publication Sdn. Bhd.