Recent questions tagged #mcq

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Consider sunlight incident on a pinhole of width 103A. The image of the pinhole seen on a screen shall

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Consider the diffraction patern for a small pinhole. As the size of the hole is

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For light diverging from a point

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A particle is dropped from a height H. The de Broglie wavelength of the particle as a function of height is proportional

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The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1 MeV energy is

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Consider a beam of electrons (each electron with energy E0) incident on a metal surface kept in an evacuated chamber.

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Consider Fig. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of θ that

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A proton, a neutron, an electron and an α-particle have same energy. Then their de Broglie wavelengths compare

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An electron is moving with an initial velocity ` v = v_0hat i` and is in a magnetic field 0 `B=B_ 0hatj`. Then it’s de Broglie

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An electron (mass m) with an initial velocity `V=v_0hati(v_0 > 0)` is in an electric field 0 0 ˆ `E = –E_0hati ( E_0constant > 0)` . It’s de Broglie wavelength at time t is given

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An electron (mass m) with an initial velocity ` v = v_0hat i` is in an electric field `E=E_0hatj`. If `λ_0 = h/(mv_0)`, it’s de Breoglie wavelength at time t is given

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Relativistic corrections become neccssary when the expression for the kinetic energy `1/2mv^2` , becomes comparable with mc2, where m is the mass of the particle. At what de Broglie wavelength will relativistic corrections become important for an

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Two particles A1 sand A2 of masses m1, m2 (m1 > m2) have the same de Broglie wavelength.

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The de Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is `V_e=c/100`.

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Photons absorbed in matter are converted to heat. A source emitting n photon/sec of frequency ν is used to convert 1kg of ice at 0°C to water at 0°C. Then, the time T taken for the

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A particle moves in a closed orbit around the origin, due to a force which is directed towards the origin. The de Broglie wavelength of the particle varies cyclically between two values λ1, λ2 with λ1>λ2. Whichof the following statement are

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A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge– Q.The surface charge density on the inner and outer surfaces of the spherical shell will be

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The surface charge density of a thin charged disc of radius R is σ. The value of the electric field at the centre of the disc is sigma/(2in_0)`. With respect to the field the centre, the electric field along the axis at a distance R from the centre of the disc reduces

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In the figure, the net electric flux through the area A is `phi=vecE.vecA` when the system is in air. On immersing the system in water the net electric flux through the

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An electric dipole is placed in a uniform electric field. The dipole will

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