莫二張六第 日三十月正年酉己夏 WAH KIU YAT PO
報日僑華
六期星
L文中學會考試題預習
地理科
(十七) 劉玉領
GEOGRAPHY (17),
50. (a) A sailor in the Southern Hemisphere on June
(2lst observes that the midday sun is 46° from
the zenith. What is the latitude of his place?
(n) Find the altitude of the aun above the horizorg.
at midday on 55 N for each of these dates. (1) the sumber solstice (11) the winter, solstide (iii) the spring equinox.
The local time of Calcutta (90°E) is 10:00 pm (Monday) whereas a place X is at 2:00 am. ((Tuezduy) according to its own local_timere What is the longitude of XA
It is 11:00 p.m. Monday according to G.M.T when a news broadcast is made at bondon, Ad what time (by local time) must a man tune in his radio so as to receive the news if he is en longitude (1) 60°F and (11) 120 W 7
(Ans. (a) On June 21st, sun's declination 'zenith distance. = sun rays are parallel
AOP 46°
Latitude of the
ven
place.
(4623) S
2235
(b) (1) Summer Solstice:
Declination figure
Zenith distance
=
wegn = 23g1
23/
gitude of the: middav
90 - 311 5810
(Figure 2)
(ii) Winter Solstice:
Declination of the sun Zenish distance"
55
altitude of the midday sun
90° 7819
111 (Zigure 3)
(iii) Spring Bquinox517
Declination of the、sun Zenith distance = 55
Figure
alygtudeggg she miaaay eum
35 (Figure 4)
Figure.
31: Explain with Labelled diagrams; way
(a) The average. December temperature in New
Zea
land is highěr than its average Jane temperaw ture.
(HY.Between March 21st and September 23rd, ays
are longer than nights for places in the Northern Hemisphero
(e) The length in miles of is longitude 1n=
creases from the Poles to the Equator whereas the length. in miles of 1 of latitude remains. conetant on all Longitudes.::
The earth revolves round the sun once in a year along its orbit. Its axis is hot
per pendi cilar to the Orbital Plane but inclin at an angle of 238 At different times of: a year, the same place will have different angles with the sun. This gives rise to equal: amounts of eun rays heating up areas various extents, and results in different temperatures.
New Zealand: lies between. 350s and 45"s December 22nd when the sun is overhead at the Tropic of Capricorny the southern hemia- phere is tilted towards the san and therefore: receives sun rays for a longer period (be- cnuse,dnys' re longer than nights) and with greater intensity ( because the sun's. altitud is greater). The reverse is true on June 21s when the bun is overhead at the Tropic: Cancer. Then, the heat :intensity is less ano days are shorter in New Zealand, This is why the average. December temperature an New Zea and is higher than the avera o experienced in June.
June 21st
Wight
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:vec. 22nd
stion. to
certain latitude can be found by dividing
the length of the parallel by 360 since every parallel has an angle of 350 at the centre For instance, the length between C and D in the diagr m ̇is equal to t/360 of the length of the equator, gnd:AB. equals to 1/360 of the. Length of the 80° parallel. However, the parallels are lot circles of equal magnitude, but they get progressively smaller away from: the gquator. Cansequently, the length in miles of 1 Aongitude increases from high latitudes to the equatow
On the contrary, the lengthin miles: od remains constant an all longitudes, for i can be calculated by dividing the length of. the: longitude line by 180 since every meridian. has an angle of 180 at the centre. But all meridians are of equal magnitude. Therefore,
can be expressed invariably as
23 000 miles / 360)Y
*Figure
Figure
o) As the earth rotates from west to east and
completes one potation in 24 hours, át turn. an angle of 15 in one hour
Difference in time between Calcutta & X
weet 4 hours.
It is given that X has a local time ahead
of the Local time of Calcutta, Bd X lies
to the east of Calcutta.
utane, in latitude degren between them
4 hours $150
5/hour
60
*he longitude of the given place
(60+90) E
150°g (Figure 5}
(a)) As the place is situated to the east.
the Greenwich, its local time, must be.
bahind the G.M.T
Distance in longitude degrees between place and London = 60°.
Difference in time
15/chour
4 hours.
Ithe man must switch on his radio
* 7:00 p.m. Monday
the
【(11) As the place is situated to the west of
the Greenwich, its local time must be "ahad on the G.MT
Distance in Longitude gonneas batmen place and London
Difference in time
120 + 15/ hour 8 hours the man must switch on his radio at7:00a.m. Tuesday(Figure 6).
forth's
rotition from west
Figure
P
90%
2:00a.m.
Bundles A and B carry equar amounts or
heat energy, Bundle A has its ener spread over. a larger surface and therefore the temperature is lower at A
The earth spins on its axis once every 24 hours, giving rise to the phenomenon of day and night, The half of the earth facine: the sun will be lit up by the sun's rays, "while the other half will be in darkness.
However, the earth's axis is permanently tilted at an angle of 661° to the earth's Orbital Plane, As a result, the Northern Hemi-J sphere is tilted towards: the sun while at other times, it is turned away from it..
Between March 21st and September 23rd, vu sun has a northern declination. That is to say, the sun is overhead at a certain latitude in the Northern Hemisphere. As illustrated in: the diagram below, all places lying to the north of the equator, on June 21st for instance have to rotate through a longer length of light than darkness,
days are longer than nights.
NIGHT
DAY
60°
10:00 p.m. Mon.
length in miles of 1. longitude
Questions for Next Week
69.4 mile
32 How 19 granite formed.
Describe the features caused by denudation in granitic areas of Hong Kong.
(a) Describe the features of fold. mountaine
illustrating your answer with well-babelled diagram
What is means oy pad fold mountains and youn gold mountains ?
Give the main difference between them and explain why.
(c) In what ways are fold mountains adfantageous