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:

I just took the test

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10