1970-04-02 — Page 28

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170英文中學會考試題預習專欄

書院主編 M

物理彩

PHYSICS (22)

Heat - Bultiple

SOUND

Choice

Direction

Each question or insegULGIN-STATEMent below im followed by five nuggested answers or completions, Select the best one that answers or completes it. Answers

The correct epavers, and explanation appear im mediately on the next issue.

Sound travels fastest int

(A)

an iron rail

(C) Water

a vacuum

all the above with the same speed,

The ratio of velocity or sound in sir at 4 at- mospheric pressure, to ita velocity a 1 atmos-. pheric pressure at the same temperature;

14

(4) (B)111

021 (D) 1 : 2

(E) 421-

The human ear can hear sound from about 20 opa

to 20,000 cps. This frequency range is called

(A) low frequency,

(B) high frequency

(C) visible frequency

(D) very high frequency!

(E)audible frequency

Starting at the point A, how many complete cycl@@ can you count in this series of waves?

ААА

A

оле

two

two and one quart

two and a half five

A

5. Which or the following represents the amplitude

of vibration of the wave motion shown?

(A) AB

(B) RAG (0) 40

(D】WAN

E) LE

A

The wave motion shown indicates a sound wave hav¬

sing

a decresing frequency

(B)

a decreasing pitch

(C) a decrease in intensity.

(D) an increasing pitch.

and increase in loudпces

AAA АА

body that is vibrating in reusdence must

(B)

vibrate at the maximum possible amplitúd vibrate at a frequency higher than ita normal frequency

報日僑華

A piano key when pressed emits a note or freq-

quency 256 cps. What is the frequency of another, note one octave higher?

(A) 25.6 (B) 64.0

264.0

(D) 512.0 (E) 2560.0

When tuning fork A is sounded together with tuning) fork B (440 cps), there are 3 beats per seconde When A is sounded with tuning fork C (442 cps),\ there are 5 beats per second. - The frequency, ope, of the tuning fork 4 is

(A) $437

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44 能並需望和同凡能伤之面速到對本性行業有正確之認識。 HSHAFERENCE TESKSENSE-BÉKEZEL 他們予炸案的行業。梁氏並表示,該研討會之目的,主迷憑爲此而提出 【多數爲一幅午,能爺一旦出外謀生時,好多感徬福等主,不知那一段過

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「擔無可在每次的專翮國衣上,扱出實際的問題,由 「壆校,俳鹘花爲期两天的會案中,分別添加了有十二個介租金港代表性。 參加此忠班討會之王千餘名同學,佔的均是來自本九及新界的廿五

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學生職業輔導研討會

昨日盛大舉行

辦 目的在於向中學生提供就業

·由觀塘黃大仙九龍城民政署主

業主

• (NIRAN) BEND - (MEXT) -- (HAR

學龍

439.

443

445

447

A glass cylinder 1 metre! long is filled to the tor with water. A strip of

scale is pasted on the.

wide. A tuning fork vibay rating at 288 ops is posi-)

tioned just above the top

Of the graduated cylinder. Water is now slowly let out from the bottom of

the cylinder until the

sound from the tuning

fork and the cylinder

reachen a maximum loudness,

If we neglect the end-

correction what is the

length of the water columnƑ

in the cylinder when this happens? The speed of sound in air is 330 metre per second.

28.7. om (B) 42.7 cm (C) 57.3 cm

71.3.04

(D)

78.4 cm.

[13. Nodea and antinodes occur

166

(C)

be excited by impulses equal to its own frequency

be made of the same material as the sound source

30.

in all kinds of waves:

only in stationary transversa waVER- only in stationary polarized waves

(D) only in stationary tongitudinal vaved (E) in all stationary wavem

The frequency of a sound emitted by a given vib- rating string várias

inversely with the tension of the string

(B) directly proportional to the tension of

the string

(C)

directly proportional to the square

the tension of the string

(V)

(E)

directly proportional to the square- root of the tension of the string. indirectly proportional to the square- root of the tension of the string

The wavelengths of the sound emitted by string of the same tension, same material, and pame thickness but of different lengths are

proportional to the lengthe

are inversely proportional to the square root of the lengths

(C) proportional to the length

proportional to the square root of the lengths

(E) not affected by the lengthe

The lowest note given out by a vibrating st

called ite

(A) first overtone

(B)

fundamental

(c)

hardonic

(D)

cotave

the wire of a sonometer is shortened,

emitted will

(A) have a better timbre

(B) travel faster

(D) have a higher pitch

(G) become louder

the 'sound.

The fundamental frequency of a closed pipe is 150.

The frequency of the second overtone produced in

(A) 300 (B)

600

(接第七張第一頁)

藝中文中學會考試題預習專欄

英文科

(#) 王淑方

(ii) The hall was full of people. He was able

to get a seat. (use although)-

Ans. Although the hall was full of people, het

was able to get a seat.

(a) He was badly hurt by fire. They decided to rush

him to hospital.

((b) She heard that her aunt had came. She went home

immediately. (Use las

as')

(c) The thief was afraid of being caught. The thief

ran away quickly. (Use 'as').

(d). She kept on working. She was very tired.

(use 'as though")

(e) Little boys are usually naughty. This is quite

natural. (Begin with 'It is quite natural!?

(f) Jack was a very good runner, He won five meda

(Use 'such a')

0

Some people do not enjoy working them. (Use one of those')

He

(h) We like oranges. They are good for health.

(Use because')

(i) I saw him three weeks ago. I have not seen him

since. (Begin with 'I have not')

(3) The sum was very difficult. She could not de it,

(Use too

In order

nan firen a gun in front of a cliff.

to hear the echo of the gun he must be standing in front of tye cliff at a distance or

(A) 55 ft

(3)

100 ft

C)

-110 ft

550 It

(E).

more than 550 ft.

(A)

(B)

II.

III.

IVA

O AB

be excited by impulses of great intensity

the frequency of a wave is doubled while the amplitude is kept constant, the intensity i therefore

the case

(B) halved (c) doubled

8

fourfold

decreased by two

Tuning forks of frequenojes 508, 512 and 516 vibe rations per second are sounded together. Beats are heard with frequencies expressed, in vibrations per, second of

4 and 6.

(B) and a

2 and 4

4 and 8"

4

(B) have a lower frequenci

A four-foot open organ pipe is sounded. The length

in feet, of the closed organ pipe that will sound the

same fundamental note is

450

(D) 750 900

A sounded tuning fork is put just above an air column opened at both ende. A resonance with nodes occure in it, The length of this air co lumn is equal to

1/4 wavelength

(B) 1/2 wavelength

(E)

3/4 wavelength

} one wavelength.

two wavelength

Two sound waves of equal frequency and amplitude are propagated in the same direction. They are exactly out of phase when emitted. As a result

at of sound is heard

sound wave of double the frequency heard

a sound wave of double the amplitude enitted)

(B)

(C)

a stationary wave is emittea

(E)

a silence is produced

Of the following, the frequency of waves placed

in the order of increasing frequency will be

infrared light, ultraviolet, visible light

heat waves, light waves, radio waves heat waves, radio waves, X rays

gamma rays, infrared light, radio wavee X rays, ultraviolet rays, visible light

Light waves and X rays are different from sound waves becauser s

they are both electromagnetic waves their waves are both many thousand times loner

they are transverse waver

they are longitudinal waves

V they can travel through vacuum Statements

correct

(A) I and II only

(B) II and III only (c) II and IV only! (D) IV and V only. (E)

other combination

The increase in loudness produced by two rating bodies is called

(B) interference (c) echo

beats

resonance.

Two tuning forck, one marked 440, the other uns marked, are both etruck at the same time. Six beats per second are noted. The two possible: frequencies of the unmarked tuning forks are

(A) 334 and 446 (B) 600 and 512 (0) 506 and 518 -

506 and 512 518 and 530