9
2. A student carries out an experiment to investigate the relationship between the
length of air column,
L
and the temperature,
θ
for a fixed mass of air. Seorang murid menjalankan satu eksperimen untuk mengkaji hubungan antara
panjang turus udara,
L
, dengan suhu,
θ
bagi satu jisim udara tertentu. The result of the experiment is shows in the graph of the length of air column,
L
against the temperature,
θ
as shown in Diagram 2.1. Keputusan eksperimen ditunjukkan dalam graf panjang turus udara,
L
melawan suhu,
θ
seperti ditunjukkan dalam Rajah 2.1. a
Based on the graph
L
against
θ
; Berdasarkan graf
L
melawan
θ
; i
Determine the length of air column, L when the temperature,
θ
is 0 °C.
Show how you determine the length of air column,
L
. Tentukan panjang turus udara,
L
apabila suhu,
θ
ialah 0 °C. Tunjukkan bagaimana anda menentukan panjang turus udara,
L
tersebut.
L
= ………………………… cm [2 marks][2 markah]
ii State the relationship between length of air column,
L
and temperature,
θ
. State your reason.
Nyatakan hubungan antara panjang turus udara,
L
dan suhu,
θ
. Nyatakan alasan anda.
…………………………………………………………………….. …………………………………………………………………….
…………………………………………………………………….
[2 marks] [2 markah] iii
Calculate the gradient of the graph of
L
against
θ.
Hitung kecerunan graf
L
melawan
θ
.
[3 marks] [3 markah]
2 ai
2 1
2 aii
2 1
2 aiii
3
10
Diagram 2.1 Rajah 2.1
Graph of
L
against
θ
Graf
L
melawan
θ
10 20
30 40
50 60
1 8
L cm
θ °C 2
3 4
5 6
7
11
b i
By using the value of gradient in aiii and value of
θ
in ai, derive a linear equation for the graph.
Dengan menggunakan nilai kecerunan dalam aiii dan nilai
θ
dalam ai, terbitkan satu persamaan linear bagi graf tersebut.
[2 marks][2 markah] ii
By using the linear equation that you had derived in bi, find the value of
L
when the value of
θ
increased to 90 °C. Dengan menggunakan persamaan linear yang anda terbitkan
dalam bi, tentukan nilai
L
apabila nilai
θ
meningkat kepada 90 °C.
L
= …………… cm [2 marks][2 markah]
c State one precaution that should be taken to obtain the accurate
readings of
L
.
Nyatakan satu langkah berjagajaga yang perlu diambil untuk mendapatkan bacaan
L
yang jitu. ……………………………………………………………………………
[1 mark][1 markah]
2 bi
2 1
2 bii
2 1
2 c
1 1
TotalA2
12 16
12
Section B Bahagian B
[12 marks] [12 markah]
Answer any one question from this section. Jawab manamana satu soalan daripada bahagian ini.
3. Diagram a shows a diver is diving in swimming pool.
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