Physics-
General
Easy
Question
In Bohr model of hydrogen atom, the force on the electron depends on the principal quantum number as
- Does not depend on n
The correct answer is:
also 
and 
Related Questions to study
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Assertion : All the radioactive elements are ultimately converted in lead.
Reason : All the elements above lead are unstable.
Assertion : All the radioactive elements are ultimately converted in lead.
Reason : All the elements above lead are unstable.
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Assertion : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate.
Reason : According to classical physics all moving electrons radiate.
Assertion : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate.
Reason : According to classical physics all moving electrons radiate.
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The figure shows a graph between 
and ln|n|, where 
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The figure shows a graph between and ln|n|, where is the area enclosed by the nth orbit in a hydrogen like atom. The correct curve is
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The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is
The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is
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In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
Physics-General
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Binding energy per nucleon verses mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. The process that would release energy is
Binding energy per nucleon verses mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. The process that would release energy is
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The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve
The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve
Physics-General
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The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
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Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct
Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct
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The graph between wave number 
and angular frequency (w) is
The graph between wave number and angular frequency (w) is
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An atomic power nuclear reactor can deliver 300 MW. The energy released due to fission of each nucleus of uranium atom 
is 170 MeV. The number of uranium atoms fissioned per hour will be
An atomic power nuclear reactor can deliver 300 MW. The energy released due to fission of each nucleus of uranium atom is 170 MeV. The number of uranium atoms fissioned per hour will be
Physics-General
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The half life of radium is 1620 years and its atomic weight is 226 kgm per kilomol. The number of atoms that will decay from its 1 gm sample per second will be (Avogadro's number 
atom/kilomol)
The half life of radium is 1620 years and its atomic weight is 226 kgm per kilomol. The number of atoms that will decay from its 1 gm sample per second will be (Avogadro's number atom/kilomol)
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In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n
In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n
Physics-General
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The number of revolutions per second made by an electron in the first Bohr orbit of hydrogen atom is of the order of3
The number of revolutions per second made by an electron in the first Bohr orbit of hydrogen atom is of the order of3
Physics-General
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In a radioactive reaction 
, the number of 
particles emitted is
In a radioactive reaction , the number of particles emitted is
Physics-General
