Figure shows two tuning forks A and B of the same frequency mounted on separate sound boxes with their open ends facing each other. The fork A is set into vibration. Describe your observation :

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Solution

If one of the tuning fork, say A is set to vibration, the other tuning fork, say B, also begins to vibrate due to resonance. The vibrating tuning fork produces wave patterns with compressions and rarefactions in the air which act as a periodic force for the other tuning fork. Since the frequency of both the tuning forks are equal, vibrations of other tuning fork are called resonant vibrations.
Resonance is the tendency of a system to oscillate with greater amplitude at some frequencies than at others. Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies, or resonance frequencies. At these frequencies, even small periodic driving forces can produce large amplitude oscillations, because the system stores vibrational energy.

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Q. Two identical tuning forks vibrating at the same frequency

256 H z

are kept fixed at some distance apart. A listener runs between the forks at a speed of

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Q. Two identical tuning forks vibrating at the same frequency 256 Hz are kept fixed at some distance apart. A listener runs between the forks at a speed of 3.0m s⁻¹ so that he approaches one tuning fork and recedes from the other figure. Find the beat frequency observed by the listener. Speed of sound in air = 332 m s⁻¹.

Two identical tuning forks vibrating at the same frequency 256 Hz are kept fixed at some distance apart. A listener runs between the forks at a speed of 3.0 m/s so that he approaches one tuning fork and recedes from the other (figure 16-E10). Find the beat frequency observed by the listener. Speed of sound in air = 332 m/s.

Two identical tuning forks vibrating at the same frequency 256 Hz are kept fixed at some distance apart. A listener runs between the forks at a speed of 3.0 m/s so that he approaches one tuning fork while receding from the other (figure). Find the beat frequency observed by the listener. Speed of sound in air = 332 m/s.

State which kind of vibrations (free, forced or resonant) are the following:

i) A tuning fork is struck against a rubber pad and its stem is held in hand.

ii) Two large tuning forks each of frequency 512 Hz with their stems fixed on wooden boxes are placed 1 m apart on a table. When one is set into vibrations the other too is observed to emit sound.

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