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A child is standing in front of a straight plane mirror A child is standing in front of a straight plane mirror :- A child is standing in front of a straight plane mirror. His father is standing behind him, as shown in the fig. The height of the father is double the height…
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Consider a water tank shown in the figure. It has one wall at x = L and can be taken to be very wide in the z direction Question : Consider a water tank shown in the figure. It has one wall at x = L and can be taken to be very wide…
A particle is performing SHM with amplitude A & time T then maximum Average velocity for time interval T/4 Question :- A particle is performing SHM with amplitude A & time T then maximum Average velocity for time interval T/4. (A) (B) (C) (D) Solution :- According to question we have to find “maximum”…
A particle of mass m moving with speed u collides elastically with a sphere of radius r Question :- A particle of mass m moving with speed u collides elastically with a sphere of radius r and same mass at rest, at an impact parameter b. Find (a) Angle between their final velocities and (b)…
the de broglie wavelength of a photon is twice the de broglie wavelength of an electron Question :- the de broglie wavelength of a photon is twice the de broglie wavelength of an electron. The speed of the electron is ve = c/100. Then – Solution :- According to question, λp = 2λe ,…
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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