NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
PHXII12:ATOMS
356460
What is the energy of the electron revolving in third orbit expressed in \(eV\)?
1 \( - \,4.53\,eV\)
2 \( - \,1.51\,eV\)
3 \( - \,4\,eV\)
4 \( - \,3.4\,eV\)
Explanation:
Energy of the electron in \({n^{th}}\) orbit is \({E_n} = - \frac{{13.6}}{{{n^2}}}eV\) For third orbit, \(n = 3\) \(\therefore \;\;{E_3} = - \frac{{13.6}}{{{3^2}}}eV = - 1.51\,eV\)
KCET - 2014
PHXII12:ATOMS
356461
Statement A : Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is integral multiple of \(\frac{h}{{2\pi }}\). Statement B : Angular momentum of electron in 2\(nd\) orbit is \(\frac{{2h}}{\pi }\)
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is some integral multiple of \(\frac{h}{{2\pi }}\) i.e.,\(L = n\frac{h}{{2\pi }}\)where \(n\) is an integer called a quantum number. Angular momentum in the 2\(nd\) orbit is \(\frac{{2h}}{{2\pi }} = \frac{h}{\pi }\). So option 1 is correct.
PHXII12:ATOMS
356462
Statement A : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Statement B : According to classical PHYSICS 2025 all accelerating electrons radiate.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr postulated that electrons in stationary orbits around the nucleus do not radiate. According to this the moving electrons radiates only when they go from one orbit to the next lower orbit. Accelerated charges radiate photons. So option (3) is correct.
PHXII12:ATOMS
356463
A set of atoms in an excited state decays:
1 In general to any of the states with lower energy.
2 Into a lower state only when excited by an external electric field.
3 All together simultaneously into a lower state.
4 To emit photons only when they collide.
Explanation:
A set of atoms in an excited state decays in general to any of the states with lower energy.
356460
What is the energy of the electron revolving in third orbit expressed in \(eV\)?
1 \( - \,4.53\,eV\)
2 \( - \,1.51\,eV\)
3 \( - \,4\,eV\)
4 \( - \,3.4\,eV\)
Explanation:
Energy of the electron in \({n^{th}}\) orbit is \({E_n} = - \frac{{13.6}}{{{n^2}}}eV\) For third orbit, \(n = 3\) \(\therefore \;\;{E_3} = - \frac{{13.6}}{{{3^2}}}eV = - 1.51\,eV\)
KCET - 2014
PHXII12:ATOMS
356461
Statement A : Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is integral multiple of \(\frac{h}{{2\pi }}\). Statement B : Angular momentum of electron in 2\(nd\) orbit is \(\frac{{2h}}{\pi }\)
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is some integral multiple of \(\frac{h}{{2\pi }}\) i.e.,\(L = n\frac{h}{{2\pi }}\)where \(n\) is an integer called a quantum number. Angular momentum in the 2\(nd\) orbit is \(\frac{{2h}}{{2\pi }} = \frac{h}{\pi }\). So option 1 is correct.
PHXII12:ATOMS
356462
Statement A : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Statement B : According to classical PHYSICS 2025 all accelerating electrons radiate.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr postulated that electrons in stationary orbits around the nucleus do not radiate. According to this the moving electrons radiates only when they go from one orbit to the next lower orbit. Accelerated charges radiate photons. So option (3) is correct.
PHXII12:ATOMS
356463
A set of atoms in an excited state decays:
1 In general to any of the states with lower energy.
2 Into a lower state only when excited by an external electric field.
3 All together simultaneously into a lower state.
4 To emit photons only when they collide.
Explanation:
A set of atoms in an excited state decays in general to any of the states with lower energy.
356460
What is the energy of the electron revolving in third orbit expressed in \(eV\)?
1 \( - \,4.53\,eV\)
2 \( - \,1.51\,eV\)
3 \( - \,4\,eV\)
4 \( - \,3.4\,eV\)
Explanation:
Energy of the electron in \({n^{th}}\) orbit is \({E_n} = - \frac{{13.6}}{{{n^2}}}eV\) For third orbit, \(n = 3\) \(\therefore \;\;{E_3} = - \frac{{13.6}}{{{3^2}}}eV = - 1.51\,eV\)
KCET - 2014
PHXII12:ATOMS
356461
Statement A : Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is integral multiple of \(\frac{h}{{2\pi }}\). Statement B : Angular momentum of electron in 2\(nd\) orbit is \(\frac{{2h}}{\pi }\)
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is some integral multiple of \(\frac{h}{{2\pi }}\) i.e.,\(L = n\frac{h}{{2\pi }}\)where \(n\) is an integer called a quantum number. Angular momentum in the 2\(nd\) orbit is \(\frac{{2h}}{{2\pi }} = \frac{h}{\pi }\). So option 1 is correct.
PHXII12:ATOMS
356462
Statement A : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Statement B : According to classical PHYSICS 2025 all accelerating electrons radiate.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr postulated that electrons in stationary orbits around the nucleus do not radiate. According to this the moving electrons radiates only when they go from one orbit to the next lower orbit. Accelerated charges radiate photons. So option (3) is correct.
PHXII12:ATOMS
356463
A set of atoms in an excited state decays:
1 In general to any of the states with lower energy.
2 Into a lower state only when excited by an external electric field.
3 All together simultaneously into a lower state.
4 To emit photons only when they collide.
Explanation:
A set of atoms in an excited state decays in general to any of the states with lower energy.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
PHXII12:ATOMS
356460
What is the energy of the electron revolving in third orbit expressed in \(eV\)?
1 \( - \,4.53\,eV\)
2 \( - \,1.51\,eV\)
3 \( - \,4\,eV\)
4 \( - \,3.4\,eV\)
Explanation:
Energy of the electron in \({n^{th}}\) orbit is \({E_n} = - \frac{{13.6}}{{{n^2}}}eV\) For third orbit, \(n = 3\) \(\therefore \;\;{E_3} = - \frac{{13.6}}{{{3^2}}}eV = - 1.51\,eV\)
KCET - 2014
PHXII12:ATOMS
356461
Statement A : Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is integral multiple of \(\frac{h}{{2\pi }}\). Statement B : Angular momentum of electron in 2\(nd\) orbit is \(\frac{{2h}}{\pi }\)
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr’s second postulate states that the stationary orbits are those for which the angular momentum is some integral multiple of \(\frac{h}{{2\pi }}\) i.e.,\(L = n\frac{h}{{2\pi }}\)where \(n\) is an integer called a quantum number. Angular momentum in the 2\(nd\) orbit is \(\frac{{2h}}{{2\pi }} = \frac{h}{\pi }\). So option 1 is correct.
PHXII12:ATOMS
356462
Statement A : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Statement B : According to classical PHYSICS 2025 all accelerating electrons radiate.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
Bohr postulated that electrons in stationary orbits around the nucleus do not radiate. According to this the moving electrons radiates only when they go from one orbit to the next lower orbit. Accelerated charges radiate photons. So option (3) is correct.
PHXII12:ATOMS
356463
A set of atoms in an excited state decays:
1 In general to any of the states with lower energy.
2 Into a lower state only when excited by an external electric field.
3 All together simultaneously into a lower state.
4 To emit photons only when they collide.
Explanation:
A set of atoms in an excited state decays in general to any of the states with lower energy.