COMEDK · Physics · 29. Nuclear Physics
Mean life of a radioactive sample is \(100 \mathrm{~s}\). Then, its half-life (in min) is
- A \(0.693\)
- B 1
- C \(10^{-4}\)
- D \(1.155\)
Answer & Solution
Correct Answer
(D) \(1.155\)
Step-by-step Solution
Detailed explanation
Given, mean life of radioactive sample, \(\tau=100 \mathrm{~s}=\frac{100}{60} \mathrm{~min}=\frac{5}{3} \mathrm{~min}\) We know that,…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Two point charges \(\mathrm{M}\) and \(\mathrm{N}\) having charges \(+q\) and \(-q\) respectively are placed at a distance apart. Force acting between them is \(\mathrm{F}\). If \(30 \%\) of charge of \(\mathrm{N}\) is transferred to \(\mathrm{M}\), then the force between the charges becomes:COMEDK 2024 Medium
- The zener voltage in the circuit shown is \(\mathrm{V}_{\mathrm{Z}}=20 \mathrm{~V}\). The load resistance \(\mathrm{R}_{\mathrm{L}}=5 \mathrm{k} \Omega\) and the resistance \(\mathrm{R} \mathrm{s}=10 \mathrm{k} \Omega\). If the input voltage is \(\mathrm{V} \mathrm{s}=100 \mathrm{~V}\), then the current through the zener diode in milliampere is:
COMEDK 2025 Medium - A particle starts rotating from rest. The instantaneous angular displacement is \(\theta = 3t^3 - t^2\), where \(\theta\) is in radian and t in s; The angular velocity at \(t = 1\) s isCOMEDK 2026 Easy
- If the binding energy per nucleon in \({ }_3 \mathrm{Li}^7\) and \({ }_2 \mathrm{He}^4\) nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of p in the reaction \(p+{ }_3 L i^7 \rightarrow 2{ }_2 H e^4\) isCOMEDK 2025 Medium
- For a \(30^{\circ}\) prism when a ray of light is incident at an angle \(60^{\circ}\) on one of its faces, the emergent ray passes normal to the other surface. Then the refractive index of the prism is:COMEDK 2024 Medium
- The distance between the objective and eye piece of astronomical telescope in normal adjustment is 27 cm and its magnifying power is 8. What is the focal length of the objective lens?COMEDK 2026 Easy
More PYQs from COMEDK
- \(\text { If } \dfrac{x}{\cos \theta}=\dfrac{y}{\cos \left(\theta+\dfrac{2 \pi}{3}\right)}=\dfrac{z}{\cos \left(\theta-\dfrac{2 \pi}{3}\right)} \text { then } x+y+z \text { is equal to }\)COMEDK 2024 Medium
- The highest magnetic moment is shown by the transition metal ion with the configurationCOMEDK 2018 Easy
- The behaviour of real gas approaches ideal behaviour atCOMEDK 2023 Easy
- The area enclosed between the parabola \(y=x^{2}-x+2\) and the line \(y=x+2\) in sq units \(=\)COMEDK 2016 Easy
- A unit vector perpendicular to both the vectors \(\hat{\mathbf{i}}+\hat{\mathbf{j}}\) and \(\hat{\mathbf{j}}+\hat{\mathbf{k}}\) isCOMEDK 2019 Medium
- A cylindrical tank 0.5 m in radius, rests on a platform 1.5 m high. Initially the tank is filled with water to a height of 2.5 m. A small plug whose area is \(10^{-4} \text{ m}^2\) is removed from an orifice located on the side of the tank at the bottom. The vertical speed with which the water strikes the ground is: [Assume \(g = 10 \text{ ms}^{-2}\)]COMEDK 2025 Medium