Happy holi friends^_^.
Answer these 3 questions with explanation ....
thank u in advance
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Answers
15.
Pressure change will be minimum at both ends. In fact, pressure variation is maximum at 1/2 because the displacement node is pressure antinode.
Option
Pressure change will be maximum at both ends
This option is correct.
Option
Open end will be antinode
This option is incorrect.
Option
Odd harmonics of the fundamental frequency will be generated
This option is incorrect.
Option
All harmonics of the fundamental frequency will be generated
This option is incorrect.
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16.
given
a= 1m
as y =asin(kx-a pie)
sin[(2pie /2pie)x-2pie×1/pie ×t ]
=sin(x-2t)
so answer is option C
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17.
Your query has two doubts:
1. How to calculate the number of beats:
If there are two sources, one of frequency A, the other of frequency B, then the number of beats are given by (A-B) or (B-A), whichever is positive.
2. What is second harmonic:
If the frequency of source is X, then it's second harmonic's frequency will be given by 2X.
Now, back to your question.
Let the unknown frequency be F.
Known frequency = 250 hz
Number of beats = 4 /s
Now, from the first formula, we know that the number of beats is (F-250) or (250-F). This gives us either F = 254 or F = 246. Both of the options are present so, we will have to consider more data.
Now, moving on the next part of the question.
From the second formula unknown frequency becomes 2F.
Known frequency = 513 Hz
Number of Beats = 5 /s
Now, number of beats can be (2F-513) or (513-2F). Which gives F = 254 or F = 259.
From here can conclude that F = 254 hz
so answer is option C
HOPE IT HELPS YOU...
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