The temperature of a gas is `-68^(@)C`. To what temperature should it be heated so that (i) the average kinetic energy of the molecules be doubled and (ii) the root-mean-square velocity of the molecules be doubled ?
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When 1 mole gas is heated at constant volume, temperature is raised from 298 to 308 K. Heat supplied to the gas in 500 J. Then, which statement is cor
Correct Answer - B We know that , `DeltaH=DeltaE+pDeltaV` When, `DeltaV=0` `therefore DeltaH=DeltaE` In given problem `DeltaH=500 J ` `-W=-pDeltaV,DeltaV=0` So, `DeltaE=q=500 J`
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Calculate the number of g-molecules (mole of molecules) in the following : (i) 3.2 gm `CH_(4)` (ii) 70 gm nitrogen (iii) `4.5xx10^(24)` molecules of o
(i) 3.2 gram `CH_(4)` number of moles `(CH_(4))=(w)/(M)=(3.2)/(16)=0.2` moles (ii) 70 gram `N_(2)` Number of moles `=(w)/(M)=(70)/(28)=2.5` (iii) `4.5xx10^(24)` molecules of `O_(3)` Number of moles `=("no. of molecules ")/(N_(A))=(4.5xx10^(24))/(6xx10^(23))=7.5` (iv)...
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Consider the situation of the previous problem. Find the average electric field energy stored in the capacitor and the average magnetic field energy s
Correct Answer - `25 mJ,5 mJ`
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When an ideal gas is heated at constant pressure, the fraction of the heat energy supplied whicn increases the internal energy of the gas is :
Correct Answer - D `{:(dQ=dW+dU,,,,),(dQ=PdV+dU,,,,),(dQ=nRdT+dU,,,,):}` `dQ=(2dU)/(f)+dU" "[dU=(nfRdT)/(2)]` `(dU)/(dQ)=(1)/(((2)/(f)+1))` `(dU)/(dQ)=(5)/(7)`
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Photosysthesis si a bio process by which plants make energy rich molecules from low energy molecules with the help of energy from sunlight . The photo
Correct Answer - Energy of 1 mole of photon = `nxx (hC)/(lambda) = 6.023 xx 10^(23) xx (6.625 xx 10^(-34) xx 3 xx 10^(8))/(650 xx 10^(-9) xx 10^(3)) = 184...
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The average speed of nitrogen molecule is v. if the temperature is doubled and nitrogen molecule dissociate into nitrogen atoms completely then new av
`v_(mg)=sqrt((8)/(pi)(RT)/(M))` `N_(2)(g)rarr2N(g)` `((v_(avg))N)/((v_(avg))N_(2))sqrt((28xx2T)/(14xxT))=sqrt(4)=2` `(v_(avg))_(N)=2v`
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At what temperature the average value of the kinetic energy of the molecule of a gas will be `1//3` of the average value of kinetic energy at `27^(@)C
Correct Answer - `-173 ^(@)C`
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An alpha particles kinetic energy `T= 5.3 MeV` initiates a nuclear reaction `Be^(9)(alpha,n)C^(12)` with energy yield `Q=+5.7MeV`. Find the kinetic en
Correct Answer - `[T_(n) = (Q + (1 -m_(a)//m_(c))T)/(1 + m_(n)//m_(c)) = 8.5 MeV]`
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When a gas is heated the particles move more quickly. What is the change in volume of a heated gas if the pressure is kept constant ?
The volume of the gas increases on heating if pressure is kept constant.
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The resistance of a silver wire at `0^(@)C " is " 1.25 Omega`. Upto what temperature it must be heated so that its resistance is doubled ? The tempera
Correct Answer - `267^(@)`, Yes
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