Lightning - Marvel EDU

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Practice Listening: Multiple Choice, Single Answer ID: #41049 Medium Lightning

Instructions ›

You will see a video about how lightning forms and the process it involves. Listen to the recording and answer the multiple-choice question by selecting the correct response. Only one response is correct.

Transcript:

Lightning is a high current electrical discharge in the atmosphere from the clouds are the most common producers for this discharge to occur. There must be a charge separation margin of within the cloud to cause electrical breakdown of the air. Thunder clouds generally develop a high negative. Charge at the base while the ground is positive relative to the cloud. When this large potential difference is discharged, the result is lightning. A lightning stroke begins with an invisible discharge called the stepped leader, which moves downward in discrete steps. As the negative leader approaches the ground, another leader moves up to meet it. When the two made contact, visible, lightning called the return stroke instantaneously propagates upward from the ground along the path of the leaders. Subsequent strokes will occur until the charge centre in the cloud. Did you pay them?

What initiates the visible lightning during a storm?

* Listen to the recording and select the correct answer

The meeting of the stepped leader from the cloud with another leader from the ground The development of a high negative charge at the cloud's base The discharge of the large potential difference between cloud and ground The instantaneous propagation of the return stroke upward from the ground

Result:

AI explanationShows the answer. Tap to open.

Option 1: "The meeting of the stepped leader from the cloud with another leader from the ground"

Explanation: The text states that when the negative leader from the cloud approaches the ground, another leader moves up to meet it. This meeting initiates the visible lightning, referred to as the return stroke, which is explicitly mentioned in the text as the moment when visible lightning occurs. This aligns perfectly with the main idea of the text, which focuses on the process of lightning formation.

Option 2: "The development of a high negative charge at the cloud's base"

Explanation: While the text mentions that thunder clouds develop a high negative charge at the base, this alone does not initiate visible lightning. It is a necessary condition for lightning to occur, but it does not directly answer the question about what initiates the visible lightning. Therefore, this option is too narrow and does not encompass the complete process described.

Option 3: "The discharge of the large potential difference between cloud and ground"

Explanation: Although the discharge of the potential difference is part of the lightning process, it does not specifically address what initiates the visible lightning. The text indicates that the visible lightning occurs when the leaders meet, making this option incomplete and not directly relevant to the question.

Option 4: "The instantaneous propagation of the return stroke upward from the ground"

Explanation: This option describes a part of the lightning process but does not initiate the visible lightning. The text clarifies that the return stroke occurs after the leaders meet, which is the actual initiation of visible lightning. Thus, this option is misleading as it focuses on a subsequent event rather than the initiation.

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