Answers by kritika

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Radon-222 has a half-life of \(3.8\) days. If one starts with \(0.064 \mathrm{~kg}\) of Radon-222, the quantity of Radon-222 left aft er 19 days will be

answered Dec 14, 2021 in Kinematics

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When light of frequency \(v_{1}\) is incident on a metal with work function \(W(w h e r e, h>W)\), the photocurrent falls to zerd at a stopping potential of \(\mathrm{V}_{1} .\) If the frequency of light is increased to \(\mathrm{v}_{2}\), the stopping potential changes to \(\mathrm{V}_{2}\). Therefore, the charge of an electron is given by

answered Dec 14, 2021 in Kinematics

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The de Broglie wavelength of an electron is \(0.4 \times 10^{10} \mathrm{~m}\) when its kinetic energy is \(1.0 \mathrm{keV}\). Its wavelength will be \(1.0 \times 10^{-10} \mathrm{~m}\), when its kinetic energy is

answered Dec 14, 2021 in Kinematics

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Two monochromatic coherent light beams \(A\) and \(B\) have intensities \(L\) and \(\frac{ L}{4}\)respectively. If these beams are super. posed, the maximum and minimum intensities will be

answered Dec 14, 2021 in Kinematics

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A proton is moving with a uniform velocity of \(\$ 0 \mathrm{~ns}^{-1}\) along the \(Y\)-axis, under the joint action of a magnetic field aloig \(Z\)-axis and an electric field of magnitude \(2 \times 10 \mathrm{Vm}^{-1}\) along the negativeX-axis. If the electric field is switched off, the proton starts moving in a circle. The radius of the circle is nearly \(\left(\right.\) given \(\frac{e}{m}\) ratio for proton \(\left.=10 \mathrm{Ckg}^{-1}\right)\)

answered Dec 14, 2021 in Kinematics

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The magnetic field due to a current in a straight wire segment of length \(\mathrm{L}\) at a point on its perpendicular bisector at a distance \(r(r>>L)\)

answered Dec 14, 2021 in Kinematics

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A charge of \(0.8\) coulomb is divided into two charges \(Q_{1}\) and \(Q_{2}\). These are kept at a separation of \(30 \mathrm{~cm}\). The force on \(Q_{1}\) is maximum when

answered Dec 14, 2021 in Kinematics

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Three capacitors of capacitance \(1.0,2.0\) and \(5.0 \mu \mathrm{F}\) are connected in series to a \(10 \mathrm{~V}\) source. The potential difference across the \(2.0 \mu \mathrm{F}\) capacitor is

answered Dec 14, 2021 in Kinematics

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A positive charge \(Q\) is situated at the centre of a cube. The electric flux through any face of the cube is (in SI units)

answered Dec 14, 2021 in Kinematics

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A solid rectangular sheet has two different coefficients of linear expansion \(\alpha_{1}\) and \(\alpha_{2}\) along its length and breadth respectively. The coefficient of surface expansion is (for \(\alpha_{1} t<<1, \alpha_{2} t<<1\) )

answered Dec 14, 2021 in Kinematics

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2 moles of an ideal monatomic gas is carried from a state \(\left(\mathrm{P}_{0}, \mathrm{~V}_{0}\right)\) to a state \(\left(2 \mathrm{P}_{0}, 2 \mathrm{~V}_{0}\right)\) along a straight line path in a \(P-V\) diagram. The amount of heat absorbed by the gas in the process is given by

answered Dec 14, 2021 in Kinematics

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Temperature of an ideal gas, initially at \(27^{\circ} \mathrm{C}\), is raised by \(6^{\circ} \mathrm{C}\). The rms velocity of the gas molecules will,

answered Dec 14, 2021 in Kinematics

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A liquid of bulk modulus \(k\) is compressed by applying an external pressure such that its density increases by \(0.01 \%\). The pressure applied on the liquid is

answered Dec 14, 2021 in Kinematics

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A uniform capillary tube of length / and inner radius \(r\) with its upper end sealed is submerged vertically into water. The outside pressure is \(\mathrm{p}_{0}\) and surface tension of water is \(\gamma\). When a length \(\mathrm{x}\) of the capillary is submerged into water, it is found that water levels inside and outside the capillary coincide. The value of \(x\) is

answered Dec 14, 2021 in Kinematics

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A uniform string of length \(L\) and mass \(M\) is fixed at both ends while it is subject to a tension \(T\). It can vibrate at frequencies \((v)\) given by the formula (where \(n=1,2,3, \ldots .\).)

answered Dec 14, 2021 in Kinematics

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