1972-05-24 — Page 17

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★教儒華頁一第張五第日二十月四年子壬展夏

KIU YAT PO

1972英文中學會考試題預習專欄

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日四廿月五年二七九一曆公年一十六國民華中

(NO Toros is applied to make OP. ate in the second case).

育敎僑華

物理科(三十)

PAYELOR (30)

Solutions to quaatiosa in the lant Lunaka

54 (a) Specifio latent heat of vapouris

ation of a substance za-defined an "the amount of energy required to

change unit-man of the substance from liquid stats to vapour state at the game temperatore,

:: Bpmosrio latent heat of fumon y

· of a substance is defined as the amount of energy required to change. unit mass of the sulatanon from volio: state to liquid state, at the same temperature.

(a)(1);

[* =¿0%15m;

0.10m

Appling the new Oatselan Concention, unis negative, f in positiva.

-0.15

0.10

0.10.10.15

0.05

0.015

the minge distance "without the concave“ lana,`

57.(a) What do you know about 7

(1) Radioactivity (11) Half-life

(h) Give à table showing the nature,

masi, velocity and relative penetram! tion of alpha-, beta-particles and gasna JAYE

Plot the magnetic ra@xα between. Swoʻj parallel wires asparated by a dis tance and carrying the same current following in

The potential

marthed.

The potential et

direction

(11) opposite direction

西區

potential at

0.51 1990. 256 valt.

The drop canned

readin xhep S

the Lasaro

17

(1)

(11)

From (1), (11)

Man of Lome water - 210150

From (11) & (121)

mass-of stess' used

Esas lost by staan

220

210 - 10pm,

10 x 540 • 10x/X (100 - 56)

5840 CA

appling the New Caterian Convention,

is poitive

0,20

Let there be 's as of 200 originally

*45200034.

„Esat required to saange- 21. vo SAFET

[80% Cal.

Then" there would be sugh of wataz

0°C (Reitang peans of 100.

Bean gained by Calorimeterėj

• 150 x 0,1 m (56. of

840: OMIT

Kent gained by water (60gn,

2 (560)

The focal length of the concave lens

To form a real image at the same posis tion as the object, a plane siwe can "be used to reflect the parallel zayu

back slong their paths"

336001.

heat gainso

80% + 840 » 3360

heas lost. 5840.

80%

1640

20.50

the earth"

tic field,

Clas

The resistanos of the anno esquend to be negligibl

angos.tis rika Anto

LAN

Referring to the above, potentioseten. circuite, AB is a uniform renästance wirej (1) if the reading in the galvanometer Gin both ossen in zero, find the value of R, (ii) Find also the reading in the riameter in both cases

Solutions to the above DROBINAS

ying Flöning a right hand rule

to the Botion of DP, I che generaluf Prom oiple), the induced current ANKET

from 0 to P, irrespective of the SON

Thüre for atže, Dom 100...

current produseë in a dimeat current únich klukýn - TáĎWB"

ROSE OF LOW Griginally present - 20,5gh.

The QGSTT10200s of gas), (or absoludu ) SEDENB100 of a liquid se, the fraction of the volume by which 18 #XDADOS. PET „Čagras vias to temperature.

The "DORITSALUDE OF, ApperNOA WA mass of a liquid in the fraction of $38 volume, by which the liquid appears to (azpand, par degres "rass, un temperature Idleb Dested in an expansible, venuež.

:e100 öf giása be 3. "Than the ̈ööüfə

CLOLONA OF rast expansion of: BETONKY

plaze

The plane sirror must be perpendicular to the parallel raya emarging from the concave. Jan.

Questions for this weRKS

56. (a) State Cha'a law.

r-internal resistance.

of the bas¬

56. (4) Cha3a lav States that the current)

flowing through a conductor in directly proportional to the pat- antial difference morons its endean)

HAWAN A 1a the resistance

of the conductor and is constant 15 the tanje ture is conRSINSA

of sarosty at

there Co.

+ 75(1 − 70)]

Capacity of Wessel At

To - Volume of mercury

In the airouat shown; the voltmeter. reada 3V when B is in the open positiumy

Ca olosing the switch. 8, the reading drops to 2.6V.

Find (1) the reading in the someter.

(11) the power dissipated in each

JOBÁSŤOT

(111) the internar railstande plant battery source,

(14) the potential at póznu ay aj \\ {v} the^q.m. f. of the source E

Volume of the space

Capacity or vasnal – volume of mezo £o (1 + 1(1 − 2)] − Vo[ 1 +72(T

(Co – 76) + (1 - 70}{00Y — 71V0),

In this to be constant at differens temperaturen, (1.0. semperature independent)

Sings Co-350 als Vo 50 1.

50ml. of mercury (at room temperaturs) should be used,

55.(a) Pastors which affect the frequency

of vilration of a stretch string

x

162

Readi

the gourds,

d'ineed,

rends

fïold...... în te

when no foros le applied to OP 14 will only be acted upon by the force of gravity, which always acto downwards. When current le passed through UP and adjusted me that OP is horisontal, there aust be a' resultant upward foros equal li magnitude to whi Applying Pleming's left hand rule, OP ques take up a position OP the right as show; i cannot be on the left of: 0 because the force F will sham

nned to adjust

•Radio•aoVib-Zaga 1 kuda)

Spartantque die intég

particis prab

prodess ve another

óhanged IRGI DACALVeetams

\{(1) the vibrating length

(13) the tension in the string (111 the thicknesa.

the inasaarial of vas IS

frequency: in

length in a

tension in I

maca per unit length in Las

Nau Catanian Comm vention

imare distance. -object distancë

focal lengths

fsal in positi: gmyention.

OP is a copper strip, freely hinged?

it so that it can rotate in a vertical plane about 0 with Palkaya in contact with a circular copper loop. fized in a \testical^ plane.

A resistor B is couneares' 'to :0.at... one end and to the copper loop at the inther,"

If OP se made to rotate in-a oloola wige venae in a magnetio field an MRONL what will be the direction, of the currans {af any) in the resistor, Explain your resulta

If R is replaced by a battery and Rh in series (AB) and an adjusted until Of is horisontal, draw a diagram showing which ide it will take up. Explain your

AD/SAR VLAN vaken for half OfALSO Amber” of atoma, "to da@intageAKA

di resistor

Sampo

Nature

Velocity For C

· pene

20

.1840

J-998 ör c

100

1kan

A registor

Lanity of light

power dissipated: lo 3-Aresibtor.

Power-ULANipated in in résistƏr

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