A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz ?(sound velocity in air = 330 m s-1)
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Which of the following was a patriotic song of France during revolution? (A) Long live King (B) Long live Robespierre (C) Versailles (D) Marseillaise
The answer is (D) Marseillaise
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A rectangular waveguide having TE10 mode as dominant mode is having a cut off frequency 18GHz
(c) The inner broad-wall dimension of the waveguide is 5/2cm.
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If the velocity of sound in air is 336m/s,the maximum length of a closed pipe that would produce just audible sound is
Minimum audible frequency = 20 Hz v4l=20⇒l=3364×20=4.2m
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Consider a metallic pipe with an inner radius of 1 cm. If a cylindrical bar magnet of radius 0.8cm is dropped through the pipe,
For the magnet, eddy currents are produced in the metallic pipe. These currents will oppose the motion of the magnet. Therefore magnet’s downward acceleration will be less than the acceleration...
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Which one of the following cannot emit radiation and why? Excited nucleus, excited electron.
Excited electron because energy of electronic energy levels is in the range of eV, only not in MeV. as γ -radiation has energy in MeV.
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An organ pipe of length L open at both ends is found to vibrate in its first harmonic when sounded with a tuning fork of 480 Hz.
L/2 as λ is constant.
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A metal pipe 3 metre long was found to weigh 7.6kg. What would be the weight of the same kind of 7.8m long pipe?
7.8m long pipe weight is 19.76kg
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A flower garden is 22.50 m long. Sheela wants to make a border along one side using bricks that are 0.25 m long. How many bricks will be needed?
Correct answer is 90 bricks
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A child sits stationary at one end of a long trolley moving uniformly with a speed V on a smooth
No change The child is running arbitrarily on a trolley moving with velocity v. However, the running of the child will produce no effect on the velocity of the centre of...
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All harmonic are overtones but all overtones are not harmonic. How?
The overtones with frequencies which are integral multiple of the fundamental frequency are called harmonics. Hence all harmonic are overtones. But overtones which are non-integrals multiples of the fundamental frequency...
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