145754
Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines which it can emit while returning to the ground state is
1 $\frac{\mathrm{n}(\mathrm{n}-1)}{2}$
2 $\frac{\mathrm{n}(\mathrm{n}+1)}{2}$
3 $\mathrm{n}(\mathrm{n}-1)$
4 $\mathrm{n}(\mathrm{n}+1)$
Explanation:
A Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines- Maximum no of spectral lines $=\frac{\mathrm{n}(\mathrm{n}-1)}{2}$.
CG PET- 2007
ATOMS
145766
Equipotential surfaces associated with an electric field which is increasing in magnitude along the $x$-direction are
1 planes parallel to yz-plane
2 planes parallel to xy-plane
3 planes parallel to xz-plane
4 coaxial cylinders of increasing radil around the $\mathrm{x}$-axis
Explanation:
A Equipotential surface is always perpendicular to the direction of electric field, As the field is along $\mathrm{x}$ direction, equipotential surface must be parallel to $\mathrm{yz}-$ plane.
UP CPMT-2007
ATOMS
145774
The element which was first observed in the solar spectrum is
1 helium
2 xenon
3 neon
4 argon
Explanation:
A Helium was the first element observed in the solar spectrum. Helium was discovered in the chromospheres of sun. It was then named by Norman Lockyer and Edward Frank land as Helium. Hydrogen atoms fuse to form $\mathrm{He}$.
145754
Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines which it can emit while returning to the ground state is
1 $\frac{\mathrm{n}(\mathrm{n}-1)}{2}$
2 $\frac{\mathrm{n}(\mathrm{n}+1)}{2}$
3 $\mathrm{n}(\mathrm{n}-1)$
4 $\mathrm{n}(\mathrm{n}+1)$
Explanation:
A Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines- Maximum no of spectral lines $=\frac{\mathrm{n}(\mathrm{n}-1)}{2}$.
CG PET- 2007
ATOMS
145766
Equipotential surfaces associated with an electric field which is increasing in magnitude along the $x$-direction are
1 planes parallel to yz-plane
2 planes parallel to xy-plane
3 planes parallel to xz-plane
4 coaxial cylinders of increasing radil around the $\mathrm{x}$-axis
Explanation:
A Equipotential surface is always perpendicular to the direction of electric field, As the field is along $\mathrm{x}$ direction, equipotential surface must be parallel to $\mathrm{yz}-$ plane.
UP CPMT-2007
ATOMS
145774
The element which was first observed in the solar spectrum is
1 helium
2 xenon
3 neon
4 argon
Explanation:
A Helium was the first element observed in the solar spectrum. Helium was discovered in the chromospheres of sun. It was then named by Norman Lockyer and Edward Frank land as Helium. Hydrogen atoms fuse to form $\mathrm{He}$.
145754
Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines which it can emit while returning to the ground state is
1 $\frac{\mathrm{n}(\mathrm{n}-1)}{2}$
2 $\frac{\mathrm{n}(\mathrm{n}+1)}{2}$
3 $\mathrm{n}(\mathrm{n}-1)$
4 $\mathrm{n}(\mathrm{n}+1)$
Explanation:
A Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines- Maximum no of spectral lines $=\frac{\mathrm{n}(\mathrm{n}-1)}{2}$.
CG PET- 2007
ATOMS
145766
Equipotential surfaces associated with an electric field which is increasing in magnitude along the $x$-direction are
1 planes parallel to yz-plane
2 planes parallel to xy-plane
3 planes parallel to xz-plane
4 coaxial cylinders of increasing radil around the $\mathrm{x}$-axis
Explanation:
A Equipotential surface is always perpendicular to the direction of electric field, As the field is along $\mathrm{x}$ direction, equipotential surface must be parallel to $\mathrm{yz}-$ plane.
UP CPMT-2007
ATOMS
145774
The element which was first observed in the solar spectrum is
1 helium
2 xenon
3 neon
4 argon
Explanation:
A Helium was the first element observed in the solar spectrum. Helium was discovered in the chromospheres of sun. It was then named by Norman Lockyer and Edward Frank land as Helium. Hydrogen atoms fuse to form $\mathrm{He}$.
