聲波多項選擇題

1. 1. A sound wave travels through a liquid, a solid, and a gas as shown in the diagram. Which of the following physical quantities of the wave remains unchanged in the three media? 如圖所示，一列聲波經過一個液體、固體及氣體介質。以下哪個物理量在這三個介質中均不變？

• Amplitude振幅

• Wavelength波長

• Frequency頻率

• Velocity速度

2. The figure shows an experimental set-up for the demonstration of the speed of sound. The electronic stop-clock can be turned on when microphone X receives a sound and it can then be turned off when microphone Y receives the same sound. The distance between X and Y is 5 m. A student claps his hands just next to X and the electronic clock records a time interval of 0.015 s. The speed of sound determined by the experiment is

2. 圖中展示了用於展示聲音速度的實驗設置。當麥克風 X 收到聲音時，電子秒表可以開啟，然後當麥克風 Y 收到相同聲音時可以關閉。X 和 Y 之間的距離為 5 米。一名學生在 X 旁邊拍手，電子時鐘記錄了一個時間間隔為 0.015 秒。由實驗確定的聲音速度是

• 330

• 333

• 340

• 667

3. 3. A thunder is heard 1.5 s after a lightning is seen. What is the distance between the observer and the place where the lightning occurs?

4. 3. 一道閃電被看見後 1.5 秒後聽到了一次雷聲。觀察者和閃電發生地點之間的距離是多少？

• 4.5*10⁸

• 2.25*10⁸

• 510

• 255

A boy measures the speed of sound of air. Initially he is at position P in front of a cliff. He shouts loudly and at the same time he starts his stop-watch. He stops his stop-watch once he hears the echo from the cliff. The time interval measured is 0.6 s. He then walks away from the cliff for a distance of 70 m to position Q and repeats the above procedure. The time interval measured this time is 1.0 s.

4. 4. What is the speed of sound measured by the boy?

5. 一名男孩測量了空氣中聲音的速度。起初，他站在懸崖前的位置 P。他大聲喊叫的同時啟動碼錶。一旦聽到懸崖回聲，他停止碼錶。所測得的時間間隔為 0.6 秒。然後，他從懸崖向遠處行走 70 米 到位置 Q，並重複上述程序。這次測得的時間間隔為 1.0 秒。

6. 4. 請問這位男孩測量到的聲音速度是多少？

• 320

• 330

• 340

• 350

4. A boy measures the speed of sound of air. Initially he is at position P in front of a cliff. He shouts loudly and at the same time he starts his stop-watch. He stops his stop-watch once he hears the echo from the cliff. The time interval measured is 0.6 s. He then walks away from the cliff for a distance of 70 m to position Q and repeats the above procedure. The time interval measured this time is 1.0 s.

5. 5. What is the distance between the cliff and position P?

6. 一名男孩測量了空氣中聲音的速度。起初，他站在懸崖前的位置 P。他大聲喊叫的同時啟動碼錶。一旦聽到懸崖回聲，他停止碼錶。所測得的時間間隔為 0.6 秒。然後，他從懸崖向遠處行走 70 米 到位置 Q，並重複上述程序。這次測得的時間間隔為 1.0 秒。

7. 5. 求位置P與懸崖的距離。

• 102

• 105

• 198

• 210

6. 6. We can hear the voice of a person behind an obstacle but we cannot see the person. Which of the following statements best explains the phenomenon?

7. 6. 我們能聽到一個人在障礙物後面的聲音，但看不到這個人。以下哪個描述最好地解釋了這種現象？

• The person emits sound waves but does not emit light wave 人會放聲波但不會放光波

• Sound wave can travel in a curved line but light wave can only travel in a straight line.聲波可以曲線行走，但光波只能以直線行走

• Sound wave has a bigger degree of diffraction than light wave 聲波比光波有較大程度的繞射

• Sound wave can penetrate through the obstacle but light wave cannot.聲波可穿透障礙物但光波不能

7. 7. Sound wave can undergo diffraction more easily than light wave because

8. 聲波較光波易進行繞射，原因是

• sound wave is a longitudinal wave and light wave is a transverse wave聲波是縱波而光波是橫波

• the speed of sound wave is much smaller than the speed of light wave 聲速比光速細很多

• the frequency of sound wave is much smaller than the frequency of light wave聲波的頻率較光波頻率細很多

• the wavelength of sound wave is much bigger than the wavelength of light wave聲波波長比光波波長長很多

8. 8. Which of the following statements concerning the diffraction of sound wave are incorrect?

9. (1) Loud sound diffracts more than soft sound

10. (2) High pitch sound diffracts more than low pitch sound.

11. (3) Sound wave diffracts more than electromagnetic wave.

12. 以下有關聲波繞射的敘述中，哪些是不正確的？

（1）強聲的聲音比較容易繞射，弱聲的聲音則不容易。

（2）高音的聲音比低音的聲音容易繞射。

（3）聲波比電磁波更容易繞射。

• (1) and (2) only

  只有(1)和(2)

• (1) and (3) only

  只有(1)和(3)

• (2) and (3) only

  只有(2)和(3)

• (1), (2) and (3)

  全部均是

9. 9. Which of the following adjustments can increase the separation between positions of loud and soft sound the most?

10. 以下哪項調整最能增加強聲與弱聲訊號間的距離

• Halve the separation between S₁ and S₂ and double the frequency of the signal generator. 把S1與S2間的距離減半，另把訊號產生器的頻率加倍

• Double the separation between S₁ and S₂ and halve the frequency of the signal generator 把S1與S2間的距離加倍，另把訊號產生器的頻率減半

• Halve both the separation between S₁ and S₂ and the frequency of the signal generator把S1與S2間的距離及訊號產生器的頻率減半

• Double both the separation between S₁ and S₂ and the frequency of the signal generator.把S1與S2間的距離及訊號產生器的頻率加倍

10. 10. Which of the following statements correctly tells a difference between a sound wave and a light wave? 以下哪項能說明聲波及光波的分別？

• A sound wave has the diffraction property but a light wave does not have the diffraction property聲波有繞射特質而光波没有

• A sound wave does not have the refraction property but a light wave has the refraction property聲波没有折射特質而光波有

• A sound wave cannot travel in glass but a light wave can travel in glass聲波不能在玻璃傳遞而光波可以

• A sound wave can cause mechanical vibrations in an object but a light wave cannot cause mechanical vibrations in an object聲波可以在物體內形成機械振動而光波不能