LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
13 views
in Physics by (84.0k points)
closed by
A string of length `0.4 m` and mass `10^(-2)kg` is tightly clamped at its ends. The tension in the dtring is `1.6 N`. Idential wave pulse are produced at one end at equal intervals of time, `Deltat`. The minimum value of `Deltat` which allows constructive inetrference successive pulse is
A. (a) `0.04s`
B. (b)`0.10s`
C. ( c ) `0.20s`
D. (d) `0.40 s`

1 Answer

0 votes
by (81.6k points)
selected by
 
Best answer
Correct Answer - B
(b) KEY CONCEPT: The time required for constructive interference equal to the time period of a wave pulse.
For a string frequency `f = (1)/(2l) sqrt((F)/(m))`
:. Time period, `T = 2lsqrt((m)/(F))`
`F = 1.6N`, `m = (mass)/(length) = (10^(-2))/(0.4) = 2.5 xx 10^(-2)`
:. `T = 2 xx 0.4 sqrt((2.5 xx 10^(-2))/(1.6)) = 0.1 sec`.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...