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A ray of light is incident on a concave mirror Question : A ray of light is incident on a concave mirror . It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to…
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The coefficient of cubical expansion of mercury is 0.00018 Question :- The coefficient of cubical expansion of mercury is 0.00018/ºC and that of brass 0.00006/ºC. If a barometer having a brass scale were to read 74.5 cm at 30 ºC, find the true barometric height at 0 ºC. The scale is supposed to be…
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A plane polarized blue light ray is incident Question : A plane polarized blue light ray is incident on a prism such that there is no reflection from the surface of the prism. The angle of deviation of the emergent ray is 𝛿 = 60° (see Figure-1). The angle of minimum deviation for red…
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…