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Question #42643
The Question
Two transverse waves propagate on a taut string of linear mass density under a tension . The individual wave displacements are given by and . The resultant displacement of the string is . At and , the instantaneous spatial slope of the string is , and the phase constant is . What is the magnitude of the transverse particle velocity of the string at and ?
Options
- A.
- B.
- C.
- D.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Intuition_Breaker
Train your brain to resist "obvious" answers that are designed to deceive your intuition.
Concepts Behind This Question
Particle Velocity vs. Wave Velocity|Phase Constant Determination|Small Angle Approximation
Why This Question Is Tricky
Common Mistakes
This question tests the limits of the traveling wave relation .
Students often incorrectly apply this formula to the resultant profile of superposed waves traveling in opposite directions, which would yield the trap answer of .
By introducing a phase constant , the problem forces the student to manually apply the principle of superposition to the partial derivatives (particle velocity and spatial slope) rather than blindly multiplying the resultant slope by the wave speed.
Quick Facts About This Question
Question Information
| Subject | Physics |
| Chapter | Waves - Class 11 Part 2 |
| Concept | Particle Velocity vs. Wave Velocity |
| Difficulty | 8 |
| Cognitive Load | 7 |
| Target Solve Time | 160 sec |
| Access | Free |