育教僑華頁一第張士第
日四十月二十年于壬曆夏
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1913英文中學會考試題預習專欄
三期星
But we have seen that the ice point of water is 2730K. Hence by denoting 273°K by
the
智慧出版社主编
物理科(十三)
Ice point of water in absolute
cale, we hav
at constant
ressure
英文科
(十三)
ressure
ANSWERS TO PREVIOUS EXERCISES
SECTION A: II 1,0 2A 3.D
ECTION BIZII.
5.5 6.(,) 74(7) 8.(1): 9.(,) 10.(");
"What beautiful stamps. How did you get them?" Vick asked me.
ly cousin gave then to me. Σ gave him some
of my best ones in exchange". I said,
Some boys were quarrelling. when our teacher passed, the room.
Tho started the 11ght??
asked Mr. How
same kicked me on my leg first," said Joe..
Come with me, both of you said Mr. Ho.
ECTION
Choose the best answer.
across the correct box. is an example..
Draw a firm line
The first one
The library
A. has often visited by them. B. are often visited by them. C. a often visited by them.
D. will often visit by them." E have been visited by then.
A B C D E
The news
A. were told Tom by ug
3 was told Tom by us.
G. had told Tom
D. has told Tom by us.
3. will tell Tom by
By whom
A, took my pen.
B. takes my "pen?"
C. is taking my pen?
D. has my pen taken?
Where
00000
has my pen been taken?
A B C D S
00000
A can old atamps be bought?
B. can old stampa buy?
D. can buy old stamps?
G. could old stamps buy?
E, cat be bought old
□□□□□
were paid for your new watch had paid for your new watch? was paid for your new watch? has paid for your new watch? are paid for your new watch? BGD F
SECTION B
Put the verb in each sentence into the Passive Voice. The beginning of each new sentence is given. Example: People use the telephone a lot.
The telephone is used a lot,
People must keep Hong Kong clean. Hong Kong
2. Men have visited the moon six times.
The moon
People say that peace will soon come. It is said
People speak many languages here. Many languages
A big fire burned the factory. The factory
Someone called for the police The police
7. People will follow his example.
His example
8. Someone saw the thief running away.
The thief
Can anyone answer this question?
CAT
0. Some thing will surprise them.
Physics (13)
Expansion or gases.
The volume occupied by a sample of gas depends markedly on the press- ure to which it is subjected, as well as the temperature. This is in strong contrast to the behavior of solids and liquids where press- ure has little effect on the volume We have seen that different solids and liquids have different values of the coefficient of expansion.
For gases, the coefficient
is constant for
stant pressure.
gases at con-
The volume coefficient of a gas is defined by the equation
volume at t°C - volume at Coo volume at 090 x emperature
rise
Hence t
pressure.
X
at constant
If a graph of volume (V) with tem- perature(t) is plotted, then a straight line should be obtained as shown below
2736
- Uo(! +dt)
The intercept on the temperature. axis is approximately equal to -273°C.
The graph also shows that this is the lowest possible temperature. that can be attained by all sub- stances because at temperature below this value, the volume of the gas will be negative which is not possible. From the relation Vt = Vo(1 +αt), we can also find. when V = 0 (1
the gas),
273
zero, volume of
when volume. O from the graph. Thus the volume coefficient for all gases is approximately equal
το
at constant pressĶIE,
273
The graph shown above also enables us to define a new temperature scale. If the zero of a temperature scale is chosen at -27390 and de- noted by CK, then the temperature of ice point of water at. 1 atmos- pheric pressure in this new tem- perature scale is 273°K. This tem perature scale is called the ab solute scale and the temperature. is called the absolute temperatura The letter 'K' stands for the word,
Kelvin in memory of the great scientist Lord Kelvin. The absolute temperature is generally denoted by capital letter I and the relat- ion between the absolute temperat- ure and the Celsins scale is that
1273 + t
t in 0.
The result that ø. 273/90 for
all gases at constant pressure is known as the Gay-Lussac's law.
words, the law states that n
volume of a given mass of any gas
increases by
of its value at 273
0°C for every degree centigrade rise in temperature, provided that the pressure of the gas is kept constant. Thus explcitly, we have V ̧(1 + 273t) for all gases. Notice that in the above equation the t is in Ca
To express the
see that
V1 = √(ation in ok, we
+t)
ano:
according to the definition or absolute temperature,
at constant
The above equation is known as the Charles law; In words, the law states that the volume of a given mass of any gas is directly proportional to its absolute tem- perature, provided that the press- ure of the gas is constant. The equivalent form of the Charles law is
= constant
at constant pressure. The Gay-Lussac's law and the Charles's law, are equivalent 11. the sense that one can be derived from the other.
日七十月一年三七九一屡公年二十六國民華中
We have derived in the above the Charle's law from the Gay-Lussac's law. It is left as an exercise to the reader to obtain the Gay- Lussac's law from the Charle's law.
Another important gas law is the well known Boyle's law which state that for a given mass of any gas, the pressure of the gas is inver- sely proportional to its blume at constant temperature,
constant.
at constant temperature
PV
constant
at constant temperature.
If P denotes the pressure of the
gas at ToK and V denotes the volume at the same temperature, then
·PV =
at temperature fok Where P and V are the pressure and volume of the gas at the same temperature ToK.
It can be shown that the combinat
on of the Charle's law and the Boyle's law yields the result
constant
The constant is usually denoted by R and is called the universal gas constant. Thus ...
1 PV = RT and this equation is known as the perfect gas equation.
Example
{(1) The "volume of an air bubble is 10 litre at the bottom of a wate water pond 8 m deep. What is the volume of the bubble when it has risen to the surface of water? The atmospheric pressure is 740 mm. of mercury.
WW
atmospher
pressure
air bubble
The atmospheric pressure (40 mm. of mercury = 0.74 x 13600 m. of water = 10.0 m of water
ressure in the bubble at the surface is atmospheric = 10 m, of water. By Boyle's law, PV
18 x 10
10 x
= volume of the bubble at the surface
1.8 10 litre. Solutions to exercise 3.
Applying V = V_{1+Q(t=v.)}
cuoical expansion of glass
(1+0.000024 x 70),
70-
Pt
cubical expansion of paraffin
70
(2):
*0009x7
(1+0.00168) + 0.063
(1)x(2) V70-70-
But
mass of paraffin at 000
40 gm.
70570
= mass or paraffin at
:
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[SPOKEN ENGLISH FOR ADULT
40 x 1.00168
1.063
2. The apparent coefficient or expansion of mercury is
0.02 – 0.019685
0.019685 x 100 0.000315
9685
0.00016/°C.
gm.
The cubical expansion or glass
-0.00018 0700016
= 0.00002/00
the coefficient of linear expansior 18.
0.0000067/00.
Let 1(copper) and I (iron) be
the Lengun on une copper and Iron rod at 100°C,
and 1, and I be the length of the copper and iron rod at 0°0 respectively, then
-6. L(Iron) = L (1+90x12x10 ·(1)
-6
L(Copper)=1(1+90x17x10
(1)-(2) L(Iron)-1(copper)
But L(Iron)-1fcopper)
Hence 120
-(2)
(3)
substitute this into
Po 17 10:15
Exercise 4
1. An expansible ballon filled vith air floots on the surface
lake with of its volume sub-
erged. How deep must it be sunk in the water so that it is just in equilibrium, neither sinking 10r rising? Assume that the ten- perature of water is constant and the height of the water barometer is 1.0 m.
(未完轉入第四張第三间 )
Page 25日七十月一年三七九一层公年二十六國民華中村樂儒
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