Look at the diagram. which point identifies a node? a b c d

Correct answer is B

Explanation

In a standing wave, node is a point where amplitude of the wave is minimum or zero. For example, in a guitar in which string vibrates, the ends of the string are known as nodes. In this question at point B amplitude of the wave is minimum (approximately zero). Therefore in this figure point B  is node. And the point where the amplitude of the wave is maximum is known as anti-node.   antinodes occur midway between the nodes. In given figure at point A amplitude is maximum, therefore point A is anti node.

the correct answer is B

Explanation:

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luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.