MEDIUM
11th ICSE
IMPORTANT
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What is the difference between forced vibration and resonance vibrations?

Important Questions on Free, Damped and Forced Oscillations

HARD
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 27 - Free, Damped and Forced Oscillations>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 1
If a simple pendulum has significant amplitude (up to a factor of 1e of original) only in the period between t=0 to t=Ï„, then Ï„ may be called the average life of the pendulum. When the spherical bob of the pendulum suffers a retardation (due to viscous drag) proportional to its velocity, with b as the constant proportionality, the average lifetime of the pendulum in (assuming damping is small) in seconds:
HARD
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 27 - Free, Damped and Forced Oscillations>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 2

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5 s. In another 10 s it will decrease to α- times its original magnitude, where α equals: