Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Waves question

2000 · Q164
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Waves
  5. /2000 · Q164

Waves question

2000 · Q164

NEETPhysicsWavesMCQ+4 / −1
A string is cut into three parts, having fundamental frequencies n1, n2, n3 respectively. Then original fundamental frequency n related by the expression as
  1. A
    1n=1n1+1n2+1n3{1 \over n} = {1 \over {{n_1}}} + {1 \over {{n_2}}} + {1 \over {{n_3}}}n1​=n1​1​+n2​1​+n3​1​
  2. B
    n=n1×n2×n3n = {n_1} \times {n_2} \times {n_3}n=n1​×n2​×n3​
  3. C
    n === n1 + n2 + n3
  4. D
    n=n1+n2+n33n = {{{n_1} + {n_2} + {n_3}} \over 3}n=3n1​+n2​+n3​​
View written solutionFree

Correct answer: A

As n∝(1/l)n \propto \left( {1/l} \right)n∝(1/l)

l=l1+l2+l3l = {l_1} + {l_2} + {l_3}l=l1​+l2​+l3​

∴1n=1n1+1n2+1n3 \therefore {1 \over n} = {1 \over {{n_1}}} + {1 \over {{n_2}}} + {1 \over {{n_3}}}∴n1​=n1​1​+n2​1​+n3​1​

Previous

More from Waves

  • A pipe open at both ends has a fundamental frequency f in air. The pipe is now dipped vertically in a water drum to half of its length. The fundamental frequency of the air column is now equal to:2025 · MCQ
  • The displacement of a travelling wave y=Csinλ2π​ (at −x) where t is time, x is distance and λ is the wavelength, all in S.I. units. Then the frequency of the wave is2024 · MCQ
  • The 4th  overtone of a closed organ pipe is same as that of 3rd  overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is :2023 · MCQ
  • The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is2023 · MCQ
  • An organ pipe filled with a gas at 27∘C resonates at 400 Hz in its fundamental mode. If it is filled with the same gas at 90∘C, the resonance frequency at the same mode will be2022 · MCQ
  • If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is2022 · MCQ
  • In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency of A is 530 Hz, the original freqnency of B will be :2020 · MCQ
  • The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is2018 · MCQ