JEE Mains Physics 2002-2019 Solved Video Solutions
Radiation, with wavelength 6561 Å falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of 3 × 10^–4 T. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to
23
Sep
Radiation, with wavelength 6561 Å falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of 3 × 10^–4 T. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to Radiation Which of [...]
A vessel of depth 2h is half filled with a liquid of refractive index 2√2 and the upper half with another liquid of refractive index √2. The liquids are immiscible. The apparent depth of the inner surface of the bottom of vessel will be :
23
Sep
A vessel of depth 2h is half filled with a liquid of refractive index 2√2 and the upper half with another liquid of refractive index √2. The liquids are immiscible. The apparent depth of the inner surface of the bottom of vessel will be : Which of the following gives a reversible operation? September 23, [...]
A particle moving with kinetic energy E has de Broglie wavelength λ. If energy ΔE is added to its energy, the wavelength become λ/2. Value of ΔE, is :
23
Sep
A particle moving with kinetic energy E has de Broglie wavelength λ. If energy ΔE is added to its energy, the wavelength become λ/2. Value of ΔE, is : A particle moving with kinetic energy E has de Broglie wavelength λ. If energy ΔE is added to its energy is the wavelength become λ/2. Value [...]
A charged particle of mass ‘m’ and charge ‘q’ moving under the influence of uniform electric field E vector i and a uniform magnetic field B vector k follows a trajectory from point P to Q as shown in figure. The velocities at P and Q are respectively, v i and -2v j. Then which of the following statements (A, B, C, D) are the correct ? (Trajectory shown is schematic and not to scale) :
23
Sep
A charged particle of mass ‘m’ and charge ‘q’ moving under the influence of uniform electric field E vector i and a uniform magnetic field B vector k follows a trajectory from point P to Q as shown in figure. The velocities at P and Q are respectively, v i and -2v j. Then which [...]
Two particles of equal mass m have respective initial velocities ui and u((i + j)/2). They collide completely inelastically. The energy lost in the process is :
23
Sep
Two particles of equal mass m have respective initial velocities ui and u((i + j)/2). They collide completely inelastically. The energy lost in the process is : Two particles of equal mass m have respective initial velocities ui and u((i + j)/2). They collide completely inelastically. The energy lost in the process is : September [...]
Consider two ideal diatomic gases A and B at some temperature T. Molecules of the gas A are rigid, and have a mass m. Molecules of the gas B have an additional vibrational mode, and have a mass m/4. The ratio of the specific heats (CAV and CBV ) of gas A and B, respectively is :
23
Sep
Consider two ideal diatomic gases A and B at some temperature T. Molecules of the gas A are rigid, and have a mass m. Molecules of the gas B have an additional vibrational mode, and have a mass m/4. The ratio of the specific heats (CAV and CBV ) of gas A and B, respectively [...]
The first member of the Balmer series of hydrogen atom has a wavelength of 6561 Å. The wavelength of the second member of the Balmer series (in nm) is:
23
Sep
The first member of the Balmer series of hydrogen atom has a wavelength of 6561 Å. The wavelength of the second member of the Balmer series (in nm) is: The first member of the Balmer series of hydrogen atom has a wavelength of 6561 Å. The wavelength of the second member of the Balmer series [...]
An electric dipole of moment vector p = (-i – 3j + 2k) x 10^-29 C. m is at the origin (0, 0, 0). The electric field due to this dipole at vector r = i + 3j + 5k (note that vector(r.p) = 0) is parallel to:
23
Sep
An electric dipole of moment vector p = (-i – 3j + 2k) x 10^-29 C. m is at the origin (0, 0, 0). The electric field due to this dipole at vector r = i + 3j + 5k (note that vector(r.p) = 0) is parallel to: 0). The electric field due to this [...]
An asteroid is moving directly towards the centre of the earth. When at a distance of 10R (R is the radius of the earth) from the earths centre, it has a speed of 12 km/s. Neglecting the effect of earths atmosphere, what will be the speed of the asteroid when it hits the surface of the earth (escape velocity from the earth is 11.2 km/s) ? Give your answer to the nearest integer in kilometer/s _____.
23
Sep
An asteroid is moving directly towards the centre of the earth. When at a distance of 10R (R is the radius of the earth) from the earths centre, it has a speed of 12 km/s. Neglecting the effect of earths atmosphere, what will be the speed of the asteroid when it hits the surface of [...]
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An asteroid is moving directly towards the centre of the earth. When at a distance of 10R (R is the radius of the earth) from the earths centre ,
it has a speed of 12 km/s. Neglecting the effect of earths atmosphere ,
what will be the speed of the asteroid when it hits the surface of the earth (escape velocity from the earth is 11.2 km/s) ? Give your answer to the nearest integer in kilometer/s _____. ,
A ball is dropped from the top of a 100 m high tower on a planet. In the last (1/2)s before hitting the ground, it covers a distance of 19 m. Acceleration due to gravity (in ms^–2) near the surface on that planet is _____
23
Sep
A ball is dropped from the top of a 100 m high tower on a planet. In the last (1/2)s before hitting the ground, it covers a distance of 19 m. Acceleration due to gravity (in ms^–2) near the surface on that planet is _____ A ball is dropped from the top of a 100 [...]