A pulse travels from a spring to a thin thread that is attached to a wall. Which

Question

A pulse travels from a spring to a thin thread that is attached to a wall. Which best describes the pulse in the thread after it leaves the spring at point A (before it strikes the wall)? A The pulse is upright B The pulse is inverted. C The pulse stops. D The pulse is totally reflected with no transmission. A string is tied on a spring. Two students then stretch out the spring, as shown below. In which of the following ways does the string move when the students generate a longitudinal wave in the spring?

Explanation / Answer

At a fixed boundary, the reflected wave is inverted. At a free boundary, the reflected wave is not inverted.

When a wave traveling in a medium encounters a boundary with a lower-velocity medium (i.e., the wave speed is lower in the other medium) part of the wave is reflected and part is transmitted. For the reflected part, the boundary acts like a fixed end and the reflected wave is inverted.

When the wave encounters a higher-velocity medium there is also some reflection and some transmission of the wave. This time the boundary acts like a free end and the reflected wave is upright.

option(A) is correct answer

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Longitudinal waves are waves which travel in a direction parallel to the direction of vibrations. These are propagated as compressions and rare fractions.

hence, option (B) is correct answer

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