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The positions of the object O (real or virtual) and the image I(real or virtual) with respect to the optical axis of a spherical mirror is shown. Then select the possible mirror and its position to realise it.
11
Sep
The positions of the object O (real or virtual) and the image I(real or virtual) with respect to the optical axis of a spherical mirror is shown. Then select the possible mirror and its position to realise it. The graph shows variation of v with in u for a mirror. points plotted above the curve [...]
A block of mass m1 lies on a smooth horizontal table and is connected to another freely hanging block of mass m2 by a light inextensible string passing over a smooth fixed pulley situated at the edge of the table as shown in the figure. Initially the system is at rest with m1 a distance d from the pulley. Then the time taken for m1 to reach the pulley is.
11
Sep
A block of mass m1 lies on a smooth horizontal table and is connected to another freely hanging block of mass m2 by a light inextensible string passing over a smooth fixed pulley situated at the edge of the table as shown in the figure. Initially the system is at rest with m1 a distance [...]
Electrons of energy 12.09 eV can excite hydrogen atoms. To which orbit is the electron in the hydrogen atom raised and what are the wavelengths of the radiations emitted as it drops back to the ground state?
11
Sep
Electrons of energy 12.09 eV can excite hydrogen atoms. To which orbit is the electron in the hydrogen atom raised and what are the wavelengths of the radiations emitted as it drops back to the ground state? The first excitation potential of a hypothetical hydrogen-like atom is 15 V. Find the third excitation potential of [...]
Two blocks A and B of masses 2m and m, respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in the figure. The magnitude of acceleration of A and B immediately after the string is cut, are respectively:
11
Sep
Two blocks A and B of masses 2m and m, respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in the figure. The magnitude of acceleration of A and B immediately after the string is cut, are respectively: a2 and a3 respectively. F1 and [...]
Three masses are connected as shown in figure on a horizontal frictionless surface and pulled by a force of 60 N. The tensions Tl and T2 are in the ratio.
11
Sep
Three masses are connected as shown in figure on a horizontal frictionless surface and pulled by a force of 60 N. The tensions Tl and T2 are in the ratio. Three masses are connected as shown in figure on a horizontal frictionless surface and pulled by a force of 60 N. The tensions Tl and [...]
How many different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are excited to a state with principal quantum number n?
11
Sep
How many different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are excited to a state with principal quantum number n? How many different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are excited to a state with principal quantum number n? September [...]
The Balmer series for the hydrogen atom corresponds to electron transitions that terminate in the state of quantum number n = 2. (a) Find the longest wavelength photon emitted and determine its energy.
11
Sep
The Balmer series for the hydrogen atom corresponds to electron transitions that terminate in the state of quantum number n = 2. (a) Find the longest wavelength photon emitted and determine its energy. The first excitation potential of a hypothetical hydrogen-like atom is 15 V. Find the third excitation potential of the atom. September 11, [...]
A hydrogen atom is in the third excited state. It makes a transition to a different state and a photon is either absorbed or emitted. Determine the quantum number nf of the final state and the energy
11
Sep
A hydrogen atom is in the third excited state. It makes a transition to a different state and a photon is either absorbed or emitted. Determine the quantum number nf of the final state and the energy A hydrogen atom is in the third excited state. It makes a transition to a different state and [...]
A trolley of mass 300 kg carrying a sand bag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track. After a while, sand starts leaking out of a hole on the floor of the trolley at the rate of 0.05 kg s^−1. What is the speed of the trolley after the entire sand bag is empty ?
11
Sep
A trolley of mass 300 kg carrying a sand bag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track. After a while, sand starts leaking out of a hole on the floor of the trolley at the rate of 0.05 kg s^−1. What is the speed of the [...]
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A trolley of mass 300 kg carrying a sand bag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track. After a while ,
sand starts leaking out of a hole on the floor of the trolley at the rate of 0.05 kg s^−1. What is the speed of the trolley after the entire sand bag is empty ? ,
A piece of wire bent into an L shape with upright and horizontal portion of equal lengths 10 cm each is placed with the horizontal portion along the axis of the concave mirror towards pole of mirror whose radius of curvature is 0 cm. If the bend is 20 cm from the pole of the mirror, then the ratio of the lengths of the images of the upright and horizontal portion of the wire is
11
Sep
A piece of wire bent into an L shape with upright and horizontal portion of equal lengths 10 cm each is placed with the horizontal portion along the axis of the concave mirror towards pole of mirror whose radius of curvature is 0 cm. If the bend is 20 cm from the pole of the [...]