General Physics Question 11
Question 11
- The energy of a system as a function of time $t$ is given as $E(t)=A^{2} \exp (-\alpha t)$, where $\alpha=0.2 \mathrm{~s}^{-1}$. The measurement of $A$ has an error of $1.25 %$. If the error in the measurement of time is $1.50 %$, the percentage error in the value of $E(t)$ at $t=5 \mathrm{~s}$ is
(2015 Adv.)
is $0.5 \mathrm{~mm}$ and the 25th division coincides with the main scale line?
(2016 Main) (a) $0.75 \mathrm{~mm}$ (b) $0.80 \mathrm{~mm}$ (c) $0.70 \mathrm{~mm}$ (d) $0.50 \mathrm{~mm}$
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Answer:
Correct Answer: 11. (a)
Solution:
- Length of air column in resonance is odd integer multiple of $\lambda / 4$. The prongs of the tuning fork are kept in the vertical plane.
