A string of length L is oscillating at its second harmonic with a frequency of 5

Question

A string of length L is oscillating at its second harmonic with a frequency of 500 Hz. Both ends of the string are fixed and the speed of wave on the string is 100 m/s. A) Find the wavelength of this oscillation. B) Find the length of the string. C) If we are listening to the sound produced by the oscillation of the string as we approach it with a speed of 20 m/s, what frequency do we hear? The speed of sound in air is 343 m/s. D) If the intensity of sound produced by the string 12 m away from the string for a stationary listener is 50 W/m2, what is the intensity level 2 m away from the string? E) If the tension in string is increased by 50%, find the fundamental frequency of oscillation of the string

Explanation / Answer

5. The answer is A. Cells with more than one nuclues. It is called as polynuclei condition, it is very common in fungi and endothecium cells of the anther.

6. The answer is B. Replication of the DNA, it occurs in the interphase of the divion, not in the division phase i.e. mitosis.

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