Recently Active Physics Questions

FRee neutrons decay into protons but free protons never decay Neutrons are slightly heavier than protons are both the statements true If yes please explain ...

A vehicle approaches a stationary observer from a distance. Which of the following graphs describes the frequency heard by a stationary observer? *Image* ...

In a photoelectric effect setup , a point source of light of power 3.2*10^-2 W emits mono energetic photons of energy 5.0ev.The source is located at a distance of .8m from the center of a stationary metallic sphere of work fu ...

On two smooth fixed parallel rod, a rod of mass m and kength l is placed. Ends of fixed rod is connected with battery and resistance and uniform magnetic field is present inside the page switch is closed at t=0. *Image* A. wh ...

A conducting loop carrying a currrent I is placed in a uniform magnetic filed pointing in to the plane of the paper as shown. The loop will have a tendency to expand contract move towards positive x axis move towards negative ...

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a beam of light incident vertically on a glass hemisphere of radius R and refractive index √2 lying with its plane side on a table. the axis of beam concides with the verticle axis passing through the centre of base of the ...

A solid cylinder of mass m is placed on a rough horizontal surface and a spring of stiffness k is connected to the point A at the same level as the centre O of the cylinder. OA and OB lie in a plane perpendicular to the axis ...

Centripetal acceleration of a particle of mass m moving in a circular of radius r is 4/r2 . What is the momentum of the particle? 4m/r 4m/√r 2m/√r 2m/r ans (c) ...

*Image* a line charge λ per unit length is lodged uniformly onto the rim of a wheel of mass M and radius R. The wheel has light non- conducting spokes and is free to rotate without friction about its axis . a uniform magneti ...

*Image* the graph between distance u and image distance v for a lens is given below . the focal length of lens is (a) 5 ± 0.1 (b) 5 ± 0.05 ...

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In an experiment performed with electrons of energy 4eV, the wavelength of the electrons was measured by diffracting them from a crystal. The momentum of the electrons is now doubled. The wavelength of the electrons, after th ...

15 identical capacitances , each of 1μF are connected in a hexagonal network ABCDEF such that each vertex is connected with each of the others directly by 1μF .The capacitors and the wires in the network are insulated from ...

A solid copper (density ρ and specific heat c) of radius r at an initial temperature 200 K is suspended inside a chamber whose walls are at almost 0 K.What is the time required for the temperature of sphere to drop to 100K ...

Find the minimum coaltitude which can directly receive a signal from a geostationary satellite Please give the method to solve it ...

It is a ques from one of the tests of the test column Please explain A man skids from the top of a slide to the bottom in 1 sec There is no friction Nothing else was known What is the height of the ramp Ans is This problem ca ...

*Image* a glass prism with respective index 1.5 is immersed in water (refractive index 4/3 ). a light beam incident normally on the face AB is totally reflected to reach the face BC if (a) sin θ >8/9 (b)2/3 < sin θ &l ...

the amont of energy transferred to a stationary body of mass m2 by a collision witha moving body of mass m1 can be increased by interposing another stationarybody of mass m between m1 and m2 such that m1 strikes m and m strik ...

How do u define internal forces?? *Image* and in this one *Image* ...

A point source of light is placed at a distance h below the surface of a large and deep lake.Show that the fraction for the light energy that escapes directly from water surface is independent of height h and it is given by f ...

Two coils of wire having identical resistances, R, are connected as shown *Image* the upper end of the first coil is connected to the end of the second and vice-versa. their cross-sectional areas are A1 and A2. the two are ke ...

a piece of wax weigh 18.03 gm in air A piece of metal is found to weigh 17.03 gm in water It is tied to the wax and both together weigh 15.23 gm in water Then specific graviy of wax is Please give the solution ...

Unfortunately my answer is not matching........ *Image* ...

a ball is boucing down a flight of stairsThe coefficient of restitution is e The height of each step is d and the ball bounces one step at each bounce After each bouce the ball rebounds to a height h above the next lower step ...

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when a tap-water is turned on slowly, the water flow is smooth but it looses its smoothness wen the speed of the outflow is increased ... why?? [7] ...