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As shown in the figure M is a man of mass 60 kg Question :- As shown in the figure, M is a man of mass 60 kg standing on a block of mass 40 kg kept on ground. The coefficient of friction between the feet of the man and the block is…
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A wooden block with a coin placed on its top Question :- A wooden block with a coin placed on its top, floats in water as shown in the figure. The distance l and h are shown. After some time, the coin falls into the water. Then, (A) l decreases and h increases (B) l increases and h decreases (C) Both l and h increase…
In Bohr series of lines of hydrogen spectrum the third line Question :- In Bohr series of lines of hydrogen spectrum the third line from the red end corresponds to which one of the following inner orbit jumps of electron for Bohr’s orbit in atom of hydrogen (A) 3 → 2 (B) 5 →…
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If a spring of stiffness k is cut into two parts A and B of length lA : lB = 2 : 3, then the stiffness of spring A is given by Question :- If a spring of stiffness k is cut into two parts A and B of length lA : lB = 2 : 3,…
If the momentum of an electron is changed by p Question :- If the momentum of an electron is changed by P, then the de-Broglie wavelength associated with it changes by 0.5 %. The initial momentum of an electron will be : (A) 400P (B) P/200 (C) 100P (D) 200P Solution :- Let initial…
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Monochromatic radiation emitted when electron on hydrogen atom jumps from Question :- Monochromatic radiation emitted when electron on hydrogen atom jumps from first exited to the grounds state irradiates a photosensitive material. The stopping potential is measured to be 3.57V. The threshold frequency of the material is : (A) 2.5 × 1015 Hz…
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A proton and photon both have same energy Question :- A proton and photon both have same energy of E = 100 keV. The de-Broglie wavelength of proton and photon be λ1 and λ2 then λ1/λ2 is proportional to (A) E-1/2 (B) E1/2 (C) E-1 (D) E Solution:- de Broglie wavelength associated with a…
Relation between wavelength of photon and electron of same energy is Question :- Relation between wavelength of photon and electron of same energy is (A) (B) (C) (D) Solution :- As de Broglie wavelength associated with an electron is given by …..(1) And for photon …..(2) Using this value in…
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A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant the bullet leaves the barrel of the gun, the monkey drops. The bullet Question :- A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant the…
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A ray of light falling at an angle of 50 Question :- A ray of light falling at an angle of 50° is refracted through a prism and suffers minimum deviation. The angle of the prism is 60° . Find the angle of minimum deviation and refractive index of the material of the prism….