02. Dual Nature of Electron
Structure of Atom

238715 The frequency of radiation emitted, when an electron falls from $n=3$ to $n=1$. in a hydrogen atom would be

1 $2.92 \times 10^3$ hour $^{-1}$
2 $2.92 \times 10^{-15} \mathrm{~s}^{-1}$
3 $2.92 \times 10^{15} \mathrm{~s}^{-1}$
4 $2.92 \mathrm{~min}^{-1}$
Structure of Atom

238697 Upon irradiation with radiation of a suitable wavelength on the cathode, the photocurrent produced was reduced to zero by applying a stopping potential of $2.63 \mathrm{~V}$. If the work function of the cathode is $4.3 \mathrm{eV}$. Find the approximate wavelength of the radiation (in nm)How many among the given species have the highest bond order? $\mathrm{CN}^{-}, \mathrm{CO}, \mathrm{NO}^{+}, \mathrm{O}_2^{+}$, $\mathrm{O}_2, \mathrm{~N}_2$

1 224
2 179
3 190
4 165
Structure of Atom

238698 The work functions of $\mathrm{Ag}, \mathrm{Mg}, \mathrm{K}$ and $\mathrm{Na}$ respectively in $\mathrm{eV}$ are $4.3,3.7,2.25,2.30$, When an electromagnetic radiation of wavelength of $300 \mathrm{~nm}$ is allowed to fall on these metal surface, the number of metals from which the electrons are ejected is $\left(1 \mathrm{ev}=1.6022 \times 10^{-19} \mathrm{~J}\right)$

1 4
2 3
3 2
4 5
Structure of Atom

238699 Calculate the wave number and frequency of orange radiation having wavelength $6300 \AA$.

1 $1.587 \times 10^8 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
2 $1.587 \times 10^4 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
3 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
4 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
Structure of Atom

238700 Which of the following statements is correct about photoelectric effect ?

1 1
2 2
3 3
4 4
Structure of Atom

238715 The frequency of radiation emitted, when an electron falls from $n=3$ to $n=1$. in a hydrogen atom would be

1 $2.92 \times 10^3$ hour $^{-1}$
2 $2.92 \times 10^{-15} \mathrm{~s}^{-1}$
3 $2.92 \times 10^{15} \mathrm{~s}^{-1}$
4 $2.92 \mathrm{~min}^{-1}$
Structure of Atom

238697 Upon irradiation with radiation of a suitable wavelength on the cathode, the photocurrent produced was reduced to zero by applying a stopping potential of $2.63 \mathrm{~V}$. If the work function of the cathode is $4.3 \mathrm{eV}$. Find the approximate wavelength of the radiation (in nm)How many among the given species have the highest bond order? $\mathrm{CN}^{-}, \mathrm{CO}, \mathrm{NO}^{+}, \mathrm{O}_2^{+}$, $\mathrm{O}_2, \mathrm{~N}_2$

1 224
2 179
3 190
4 165
Structure of Atom

238698 The work functions of $\mathrm{Ag}, \mathrm{Mg}, \mathrm{K}$ and $\mathrm{Na}$ respectively in $\mathrm{eV}$ are $4.3,3.7,2.25,2.30$, When an electromagnetic radiation of wavelength of $300 \mathrm{~nm}$ is allowed to fall on these metal surface, the number of metals from which the electrons are ejected is $\left(1 \mathrm{ev}=1.6022 \times 10^{-19} \mathrm{~J}\right)$

1 4
2 3
3 2
4 5
Structure of Atom

238699 Calculate the wave number and frequency of orange radiation having wavelength $6300 \AA$.

1 $1.587 \times 10^8 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
2 $1.587 \times 10^4 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
3 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
4 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
Structure of Atom

238700 Which of the following statements is correct about photoelectric effect ?

1 1
2 2
3 3
4 4
Structure of Atom

238715 The frequency of radiation emitted, when an electron falls from $n=3$ to $n=1$. in a hydrogen atom would be

1 $2.92 \times 10^3$ hour $^{-1}$
2 $2.92 \times 10^{-15} \mathrm{~s}^{-1}$
3 $2.92 \times 10^{15} \mathrm{~s}^{-1}$
4 $2.92 \mathrm{~min}^{-1}$
Structure of Atom

238697 Upon irradiation with radiation of a suitable wavelength on the cathode, the photocurrent produced was reduced to zero by applying a stopping potential of $2.63 \mathrm{~V}$. If the work function of the cathode is $4.3 \mathrm{eV}$. Find the approximate wavelength of the radiation (in nm)How many among the given species have the highest bond order? $\mathrm{CN}^{-}, \mathrm{CO}, \mathrm{NO}^{+}, \mathrm{O}_2^{+}$, $\mathrm{O}_2, \mathrm{~N}_2$

1 224
2 179
3 190
4 165
Structure of Atom

238698 The work functions of $\mathrm{Ag}, \mathrm{Mg}, \mathrm{K}$ and $\mathrm{Na}$ respectively in $\mathrm{eV}$ are $4.3,3.7,2.25,2.30$, When an electromagnetic radiation of wavelength of $300 \mathrm{~nm}$ is allowed to fall on these metal surface, the number of metals from which the electrons are ejected is $\left(1 \mathrm{ev}=1.6022 \times 10^{-19} \mathrm{~J}\right)$

1 4
2 3
3 2
4 5
Structure of Atom

238699 Calculate the wave number and frequency of orange radiation having wavelength $6300 \AA$.

1 $1.587 \times 10^8 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
2 $1.587 \times 10^4 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
3 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
4 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
Structure of Atom

238700 Which of the following statements is correct about photoelectric effect ?

1 1
2 2
3 3
4 4
Structure of Atom

238715 The frequency of radiation emitted, when an electron falls from $n=3$ to $n=1$. in a hydrogen atom would be

1 $2.92 \times 10^3$ hour $^{-1}$
2 $2.92 \times 10^{-15} \mathrm{~s}^{-1}$
3 $2.92 \times 10^{15} \mathrm{~s}^{-1}$
4 $2.92 \mathrm{~min}^{-1}$
Structure of Atom

238697 Upon irradiation with radiation of a suitable wavelength on the cathode, the photocurrent produced was reduced to zero by applying a stopping potential of $2.63 \mathrm{~V}$. If the work function of the cathode is $4.3 \mathrm{eV}$. Find the approximate wavelength of the radiation (in nm)How many among the given species have the highest bond order? $\mathrm{CN}^{-}, \mathrm{CO}, \mathrm{NO}^{+}, \mathrm{O}_2^{+}$, $\mathrm{O}_2, \mathrm{~N}_2$

1 224
2 179
3 190
4 165
Structure of Atom

238698 The work functions of $\mathrm{Ag}, \mathrm{Mg}, \mathrm{K}$ and $\mathrm{Na}$ respectively in $\mathrm{eV}$ are $4.3,3.7,2.25,2.30$, When an electromagnetic radiation of wavelength of $300 \mathrm{~nm}$ is allowed to fall on these metal surface, the number of metals from which the electrons are ejected is $\left(1 \mathrm{ev}=1.6022 \times 10^{-19} \mathrm{~J}\right)$

1 4
2 3
3 2
4 5
Structure of Atom

238699 Calculate the wave number and frequency of orange radiation having wavelength $6300 \AA$.

1 $1.587 \times 10^8 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
2 $1.587 \times 10^4 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
3 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
4 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
Structure of Atom

238700 Which of the following statements is correct about photoelectric effect ?

1 1
2 2
3 3
4 4
Structure of Atom

238715 The frequency of radiation emitted, when an electron falls from $n=3$ to $n=1$. in a hydrogen atom would be

1 $2.92 \times 10^3$ hour $^{-1}$
2 $2.92 \times 10^{-15} \mathrm{~s}^{-1}$
3 $2.92 \times 10^{15} \mathrm{~s}^{-1}$
4 $2.92 \mathrm{~min}^{-1}$
Structure of Atom

238697 Upon irradiation with radiation of a suitable wavelength on the cathode, the photocurrent produced was reduced to zero by applying a stopping potential of $2.63 \mathrm{~V}$. If the work function of the cathode is $4.3 \mathrm{eV}$. Find the approximate wavelength of the radiation (in nm)How many among the given species have the highest bond order? $\mathrm{CN}^{-}, \mathrm{CO}, \mathrm{NO}^{+}, \mathrm{O}_2^{+}$, $\mathrm{O}_2, \mathrm{~N}_2$

1 224
2 179
3 190
4 165
Structure of Atom

238698 The work functions of $\mathrm{Ag}, \mathrm{Mg}, \mathrm{K}$ and $\mathrm{Na}$ respectively in $\mathrm{eV}$ are $4.3,3.7,2.25,2.30$, When an electromagnetic radiation of wavelength of $300 \mathrm{~nm}$ is allowed to fall on these metal surface, the number of metals from which the electrons are ejected is $\left(1 \mathrm{ev}=1.6022 \times 10^{-19} \mathrm{~J}\right)$

1 4
2 3
3 2
4 5
Structure of Atom

238699 Calculate the wave number and frequency of orange radiation having wavelength $6300 \AA$.

1 $1.587 \times 10^8 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
2 $1.587 \times 10^4 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
3 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{14} \mathrm{~s}^{-1}$
4 $1.587 \times 10^6 \mathrm{~m}^{-1}, 4.761 \times 10^{16} \mathrm{~s}^{-1}$
Structure of Atom

238700 Which of the following statements is correct about photoelectric effect ?

1 1
2 2
3 3
4 4