Resonance Notes

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  SUPERPOSITION OF WAVES CHAPTER 6 SOLUTIONS | MAHARASHTRA BOARD | PHYSICS CLASS 12

 

 

14. Two wires of the same material and same cross section are stretched on a sonometer. One wire is loaded with 1.5 kg and another is loaded with 6 kg. The vibrating length of first wire is 60 cm and its fundamental frequency of vibration is the same as that of the second wire. Calculate vibrating length of the other wire.
[Ans: 1.2 m]


15. A pipe closed at one end can produce overtones at frequencies 640 Hz, 896 Hz and 1152 Hz. Calculate the fundamental frequency.
[Ans: 128 Hz]


 16. A standing wave is produced in a tube open at both ends. The fundamental frequency is 300 Hz. What is the length of tube? (speed of the sound = 340 m s'). [Ans: 0.57 m]


17. Find the fundamental, first overtone and second overtone frequencies of a pipe, open at both the ends, of length 25 cm if the speed of sound in air is 330 m/s. [Ans: 660 Hz, 1320 Hz, 1980 Hz]  

18. A pipe open at both the ends has a fundamental frequency of 600 Hz. The first overtone of a pipe closed at one end has the same frequency as the first overtone of the open pipe. How long are the two pipes? [Ans : 27.5 an, 20.625 cm]

19. A string 1m long is fixed at one end. The other end is moved up and down with frequency 15 Hz. Due to this, a stationary wave with four complete loops, gets produced on the string. Find the speed of the progressive wave which produces the stationary wave.[Hint: Remember that the moving end is an antinode.] [Ans: 6.67 m


20. A violin string vibrates with fundamental frequency of 440Hz. What are the frequencies of first and second overtones? [Ans: 880 Hz, 1320 Hz]


21. A set of 8 tuning forks is arranged in a series of increasing order of frequencies. Each fork gives 4 beats per second with the next one and the frequency of last fork is twice that of the first. Calculate the frequencies of the first and the last fork. [Ans: 28 Hz, 56 Hz]


22. A sonometer wire is stretched by tension of 40 N. It vibrates in unison with a tuning fork of frequency 384 Hz. How many numbers of beats get produced in two seconds if the tension in the wire is decreased by 1.24 N? [Ans: 12 beats]

 23. A sonometer wire of length 0.5 m is stretched by a weight of 5 kg. The fundamental frequency of vibration is 100 Hz. Calculate linear density of wire. [Ans: 4.9.10' kg/m]


24. The string of a guitar is 80 cm long and has a fundamental frequency of 112 Hz. If a guitarist wishes to produce a frequency of 160 Hz, where should the person press the string? [Ans : 56 cm]

 

RESONANCE , BEATS , NATURAL FREQUENCY - GOOD VIDEOS

 

 

 

https://www.youtube.com/watch?v=jewSVEBkI_s
Forced Oscillation Resonance

https://www.youtube.com/watch?v=X6iJ0hPpGec
Learn to Break a Glass with Your Voice || Learn Quick


https://www.youtube.com/watch?v=C-Bn70PpbrM
Lesson 34 - Resonance - Forced Vibrations - Demonstrations in Physics

https://www.youtube.com/watch?v=qoDAue56LXM
Beats at 2 Tuning Forks

https://www.youtube.com/watch?v=IQ1q8XvOW6g
Beats Physics


https://www.youtube.com/watch?v=yia8spG8OmA
Beats Demo: Tuning Forks


https://www.youtube.com/watch?v=W4YaemEauGo
F-J's Physics - Barton's Pendulums and Resonance - Video 35


https://www.youtube.com/watch?v=vNuDxc9tZMk
Top 10 Demonstrations With Tuning Forks | Arbor Scientific


https://www.youtube.com/watch?v=XwlZBJIp1AA
Physics - 26.3 Natural Frequency and Resonance


 

WRITING Ionic Formulas: Criss-Cross Method - PRACTICE PROBLEMS - WORKSHEET - CHEMISTRY

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NAMING OF IONIC COMPOUNDS- WORKSHEET1-SOLUTIONS

NAMING IONIC COMPOUNTS - WORKSHEET 2

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 Class 10 ICSE PHYSICS BIOLOGY JOURNALS SCANS

 

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GOOD SOUND VIDEOS - YOUTUBE

 GOOD SOUND VIDEOS - YOUTUBE

 

Walter Lewin
https://www.youtube.com/watch?v=f4M-6tWtkoA

Sound: Standing Waves and Resonance | Physics in Motion
https://www.youtube.com/watch?v=wXRNKz0xMOU

The physics of sound and music
https://www.youtube.com/watch?v=oqCfdQ6kOs0



 

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Maharashtra CET mhcet Practice Questions Wave Optics

Maharashtra CET mhcet Practice Questions Wave Optics

Pdflink_waveoptics_PYQ 2020

 

Interference Class 12 Physics Solved Numerical with solutions for practice

Interference Solved Problem with Solutions for practice - YOUNG DOUBLE SLIT EXPERIMENT

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 Maharashtra Board Class 12 Physics Chapter 7 Wave Optics Questions.

 

 

 

 
13. White light consists of wavelengths from 400 nm to 700 nm. What will be the wavelength range seen when white light is passed through glass of refractive index 1.5571 [Ans: 258.06 - 451.61 nm]


 14. The optical path of a ray of light of a given wavelength travelling a distance of 3 cm in flint glass having refractive index 1.6 is same as that on travelling a distance x cm through a medium having refractive index 1.25. Determine the value of x.

15. A double-slit arrangement produces interference fringes for sodium light ( = 589 nm) that are 0.20° apart. What is the angular fringe separation if the entire arrangement is immersed in water (n = 1.33)? [Ans: 0.15°]

16. In a double-slit arrangement the slits are separated by a distance equal to 100 times the wavelength of the light passing through the slits. (a) What is the angular separation in radians between the central maximum and an adjacent maximum? (b) What is the distance between these maxima on a screen 50.0 cm from the slits?
[Ans: 0.01 rad, 0.5 cm]

17. Unpolarized light with intensity Io is incident on two polaroids. The axis of the first polaroid makes an angle of 50° with the vertical, and the axis of the second polaroid is horizontal. What is the intensity of the light after it has passed through the second polaroid? [Ans: 10/2 x (cos 40°)2]

18. In a biprism experiment, the fringes are observed in the focal plane of the eyepiece at a distance of 1.2 m from the slits. The distance between the central bright band and the 20th bright band is 0.4 cm. When a convex lens is placed between the biprism and the eyepiece, 90 cm from the eyepiece, the distance between the two virtual magnified images is found to be 0.9 cm. Determine the wavelength of light used. [Ans: 5000 A]

19. In Fraunhoffer diffraction by a narrow slit, a screen is placed at a distance of 2 m from the lens to obtain the diffraction pattern. If the slit width is 0.2 mm and one of the slits in Young's experiment is twice the intensity of the light coming from the other slit. What will be the approximate ratio of the intensities of the bright and dark fringes in the resulting interference pattern? [Ans: 34]

20. The intensity of the light coming from one of the slits in Young's experiment is twice the intensity of the light coming from the other slit. What will be the approximate ratio of the intensities of the bright and dark fringes in the resulting interference pattern?

21. A parallel beam of green light of wavelength 546 nm passes through a slit of width 0.4 mm. The intensity pattern of the transmitted light is seen on a screen which is 40 cm away. What is the distance between the two fast order minima?
[Ans: 1.1 mm]


22. What must be the ratio of the slit width to the wavelength for a single slit to have the first diffraction minimum at 45.0°? [Ans: 1.27]


 23. Monochromatic electromagnetic radiation from a distant source passes through a slit. The diffraction pattern is observed on a screen 2.50 m from the slit. If the width of the central maximum is 6.00 mm, what is the slit width if the wavelength is (a) 500 nm (visible light); (b) 50 p.m (infrared radiation); (c) 0.500 nm (X-rays)? [Ans: 0.416 mm, 41.6 mm, 4.16x104 mm]


24. A star is emitting light at the wavelength of 5000 A. Determine the limit of resolution of a telescope having an objective of diameter of 200 inch. [Ans: 1.2 x104 rad]


25. The distance between two consecutive bright fringes in a biprism experiment using light of wavelength 6000 A is 0.32 mm by how much will the distance change if light of wavelength 4800 A is used? [Ans: 0.064 mm]