Question at position 3 Click the Restart Button and then the Pulse Button. Watch the pulse travel to the right, reflect, and travel to the left. Next, click the Restart Button and select "Loose End" in the upper-right corner. (You will send another pulse down the string. But, before you do, predict what will happen.) Click the Pulse Button. Again, watch the pulse travel to the right and reflect. What did you observe? The reflected wave was upright for the fixed end, but the reflected pulse was inverted for the loose end.The reflected wave was inverted for the fixed end, but for the loose end, the reflected pulse was upright.The reflected pulse was upright for both cases.The reflected pulse was inverted for both cases.Clear my selection

Question

Question at position 3  Click the Restart Button and then the Pulse Button. Watch the pulse travel to the right, reflect, and travel to the left. Next, click the Restart Button and select "Loose End" in the upper-right corner. (You will send another pulse down the string. But, before you do, predict what will happen.) Click the Pulse Button. Again, watch the pulse travel to the right and reflect. What did you observe? The reflected wave was upright for the fixed end, but the reflected pulse was inverted for the loose end.The reflected wave was inverted for the fixed end, but for the loose end, the reflected pulse was upright.The reflected pulse was upright for both cases.The reflected pulse was inverted for both cases.Clear my selection

BlackTom AI · Accepted Answer

First, I restate the scenario to ensure understanding: you observe a pulse traveling along a string, reflecting at the ends. When the end is fixed, a reflected pulse inverts; when the end is loose (or free), the reflected pulse maintains the same orientation (not inverted). The question asks us to evaluate each provided claim about the observed reflections and determine which statement matches the described behavior.

Option 1: 'The reflected wave was upright for the fixed end, but the reflected pulse was inverted for the loose end.' This statement mixes two concepts: for a fixed end, a reflected wave is typically inverted, not upright; for a loose end, the reflected pulse is upright (not inverted). Therefore, describing the fixed end as upright is inaccurate, and describing the loose end as inverted is also inaccurate. As a result, this option contradicts the standard behavior of reflections on a string with fixed versus loose ends.

Option 2: 'The reflected wave was inverted for the fixed end, but for the loose end, the reflected pulse was upright.' This aligns with the common physics of wave reflection on a string: at a fixed end, the incident pulse inverts upon reflection; at a loose (free) end, the reflection is upright (not inverted). The wording here correctly assigns inversion to the fixed end and upright reflection to the loose end, consistent with mechanical wave behavior on strings.

Option 3: 'The reflected pulse was upright for both cases.' This asserts that both reflections appear upright regardless of end condition. While the loose end reflection being upright is correct, the fixed end reflection is typically inverted, so saying upright for the fixed end contradicts standard boundary conditions for a fixed end. Therefore this option is inconsistent with expected results.

Option 4: 'The reflected pulse was inverted for both cases.' This claims inversion at both ends. For a fixed end, inversion is expected; however, at a loose end, the reflection is not inverted but upright. Therefore this option is incorrect because it denies the known difference between fixed and loose ends.

To summarize, options 1 and 3 misattribute the inversion behavior at the fixed end or across both ends, and option 4 incorrectly asserts inversion at the loose end. Option 2 correctly pairs the fixed-end inversion with an upright reflection at the loose end, matching the established boundary-condition behavior of waves on strings.

查看解析

登录即可查看完整答案

类似问题

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

Under the assumptions used in cost-volume-profit analysis, as the activity increases:

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单