A string in a musical instrument is 50 cm long and its fundamental frequency is 800 Hz. Keeping the tension applied to the string same, the change in the length to produce sound note of fundamental frequency will be

Question:

Options :

(a) 10 cm
(b) 40 cm
(c) 60 cm
(d) 20 cm

Answer :

(a) 10 cm

Answer Steps :

step 1

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

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