力学

M-W1 : 驻波(I)

单位

波

目的

Show transverse standing waves

设备

  1. Six-feet coil-spring
  2. 小夹

建议

演示

  1. Traveling pulse, reflected pulse
  2. Speed of a pulse as a function of tension
  3. Standing waves (two fixed ends) (one to five antinodes can be reliably produced)

讨论

  1. 2个节点，1个端面
  2. 3 nodes, 2 antinodes
  3. 4 nodes, 3 antinodes
  4. 5 nodes, 4 antinodes
  5.  节点,波腹
  6.  节点,波腹

M-W2 : 驻波(II)

单位

波

目的

演示 standing waves, the effect of tension in a string on wave speed, the role of frequency

设备

  1. Cenco wave demonstrator
  2. 夹子或旋钮
  3. Hand drill with variable speed

建议

  1. At a fixed rate of rotation, vary the tension
  2. Change the speed, adjust the tension to the nearest standing wave; repeat.

讨论

请看附呈

M-W3 : 串上脉冲

单位

横向波

目的

Compare waves speed for two different strings

设备

  1. Two strings of different mass density
  2. Clamp to secure one end of strings

建议

Set the strings in parallel and ask students to predict on which will a pulse travel faster if 

  1. 弦松
  2. Strings taut with the same tension

讨论

M-W4 : 行波

单位

波

目的

Illustrates the nature of a transverse wave and rolling water wave

设备

  1. Plexi-glass water tank
  2. Cranberry juice or dye
  3. 红色标记球
  4. Wooden block to create a wave
  5. White paper marker arrow to indicate the position of the ball

建议

讨论

  1. 设置
  2. Block to be plunged into tank to initiate a wave
  3. A wave pulse is sent
  4. A wave crest passes by the ball, but does not move the ball horizontally
  5. A wave crest reaches the edge of the tank; the marker ball is still oriented with the paper arrow

M-W5 : 小波纹罐

单位

水波

目的

Illustrate circular and planar waves, interference, reflection

设备

  1. 波动箱
  2. 波发生器
  3. Accessories: probs, barriers, wetting agent (soap)
  4. 用夹子夹住
  5. Variable low-voltage power supply (0-6V, 0-1A)
  6. 投影仪

建议

See the attached instructions

讨论

请看附呈

  1. 设置
  2. Pouring in the water colored with cranberry juice
  3. 关闭-up of the hand-held wave generator
  4. 一个惠更斯源
  5. 两个惠更斯源
  6. Hand-held wave generator with attachment for a planar wave
  7. 平面波

M-W6 : 大型波纹罐

单位

波

目的

演示: Huygens Principle, Young's Experiment interference pattern, focus by a concave "water mirror", 等.

设备

  1. PASCO 波动箱 apparatus (square tank on four legs, wave generator, halogen light source
  2. Assorted implements such as barriers, plungers, flat edge, 等.
  3. A white cardboard screen OR
  4. PASCO translucent screen attachent
  5. A pitcher with water

建议

To obtain regular wave patterns it is necessary to keep the vibrating elements clean of grease so that
they are properly wetted by the water. The water depth for interference experiments should be about
1cm (deeper for refraction experiments). Best results with an amplitude setting of 2-4. 探索角色
of phase difference and frequency.

讨论

Regarding the concave water mirror (Pic. 12 below), the focus point at half a radius is manifested 
as a "Huygens source."

1. 设置
2-6. 两个惠更斯源 with increasing separation
7. 平面波 with a disturbance to be avoided
8. Correctly formed planar wave
9. Huygens source created by a planar wave impacting a 1.5厘米的狭缝
10-11. 两个惠更斯源 created by two 1.5厘米的狭缝s and the interference pattern
12. A planar wave collides with a concave plate causing the incoming waves to reflect and converge at a focal point

M-W7:管风琴

单位

纵向波

目的

演示 standing waves in an open-end and closed-end organ pipe

设备

  1. Large wooden organ pipe [NYA]
  2. 带密封的塞子

建议

Blow the pipe without and with stopper, compare the pitch

讨论

M-W8 : Acoustic Doppler

单位

多普勒效应

目的

Simple demonstration of the 多普勒效应 in sound waves

设备

  1. Tuning fork, and a mallet
  2. 一个字符串

建议

Strike the tuning fork and whirl it above head on a string varying speed and direction

讨论

MW8-Acoustic-Doppler-(1)-sm-

M-W9 : Dopler火箭

单位

多普勒效应

目的

High speed demonstration of the 多普勒效应 in sound waves

设备

  1. 帕斯科多普勒火箭
  2. 带手柄的绳子

建议

  1. Str等h the strings along the aisles of the lecture hall (don't clip anyone's head)
  2. Pull before the rocket hits your handles so that the rocket is continuously moving.

讨论

  1. Dopler火箭
  2. 火箭向下移动
  3. 火箭向上移动

M-W10:唱杆

单位

声波

目的

To dramatically illustrate standing waves in a solid

设备

  1. 压碎的松香
  2. 唱歌棒s (61, 76, 91 cm)

建议

  1. Firmly hod the rod vertically at the midpoint
  2. Gently stroke the rod from the center to the end using your rosin covered thumb and forfinger
  3. Try holding the rod at other predicted nodes.

讨论

  1. 设备
  2. 使用中的唱杆

手册页: (1) (2) (3) (4)  

回到顶部