NCERT Exemplar Class 11
Threshold frequency, v0 is the minimum frequency which a photon must possess to eject an electron from a metal. It is different for different metals. When a photon of frequency 1.0×1015s^−1 was allowed to hit a metal surface, an electron having 1.988×10^−19J of kinetic energy was emitted. Calculated the threshold frequency of this metal. equal to 600 nm hits the metal surface.
12
Nov
Threshold frequency, v0 is the minimum frequency which a photon must possess to eject an electron from a metal. It is different for different metals. When a photon of frequency 1.0×1015s^−1 was allowed to hit a metal surface, an electron having 1.988×10^−19J of kinetic energy was emitted. Calculated the threshold frequency of this metal. equal [...]
Assertion (A) It is impossible to determine the exact position and exact momentum of an electron simultaneously. Reason (R) The path of an electron in an atom is clearly defined.
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Nov
Assertion (A) It is impossible to determine the exact position and exact momentum of an electron simultaneously. Reason (R) The path of an electron in an atom is clearly defined. Assertion (A) It is impossible to determine the exact position and exact momentum of an electron simultaneously. Reason (R) The path of an electron in [...]
Assertion(A) Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason(R) The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
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Nov
Assertion(A) Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason(R) The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature. For the electrons of oxygen atom Which of the following solutions has the highest pH ? November 12, [...]
Assertion(A): All isotopes of a given element show the same type of chemical behaviour. Reason(R) The chemical properties of an atom are controlled by the number of electron s in the atom.
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Nov
Assertion(A): All isotopes of a given element show the same type of chemical behaviour. Reason(R) The chemical properties of an atom are controlled by the number of electron s in the atom. Assertion(A): All isotopes of a given element show the same type of chemical behaviour. Reason(R) The chemical properties of an atom are controlled [...]
Table-tennis ball has mass 10g and s peed of 90m/s. if speed can be meausred within an accuracy of 4%. What will be the uncertainly in speed and position?
12
Nov
Table-tennis ball has mass 10g and s peed of 90m/s. if speed can be meausred within an accuracy of 4%. What will be the uncertainly in speed and position? Table-tennis ball has mass 10g and s peed of 90m/s. if speed can be meausred within an accuracy of 4%. What will be the uncertainly in [...]
According to de Broglie, matter should exhibit dual behaviour, that is both particle and wave like properties. However, a cricket ball of mass 100g does not move like a wave when it is thrown by a bowler at a speed of 100km/h. Calculate the wavelength of the ball and explain why it does not show wave nature.
12
Nov
According to de Broglie, matter should exhibit dual behaviour, that is both particle and wave like properties. However, a cricket ball of mass 100g does not move like a wave when it is thrown by a bowler at a speed of 100km/h. Calculate the wavelength of the ball and explain why it does not show [...]
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a cricket ball of mass 100g does not move like a wave when it is thrown by a bowler at a speed of 100km/h. Calculate the wavelength of the ball and explain why it does not show wave nature. ,
According to de Broglie ,
matter should exhibit dual behaviour ,
that is both particle and wave like properties. However ,
A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz ? (sound velocity in air =30ms^−1)
12
Nov
A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz ? (sound velocity in air =30ms^−1) A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 [...]
The Balmer series in the hydrogen spectrum corresponds to the transition from n1=2 to n2=3,4…….. This series lies in the visible region. Calculate the wave number of line associated with the transition in Balmer series when the electron moves to n=4 orbit. (RH=109677cm^−1)
12
Nov
The Balmer series in the hydrogen spectrum corresponds to the transition from n1=2 to n2=3,4…….. This series lies in the visible region. Calculate the wave number of line associated with the transition in Balmer series when the electron moves to n=4 orbit. (RH=109677cm^−1) 4........ This series lies in the visible region. Calculate the wave number [...]
Wavelengths of different radiations are given below: (A) 300nm (B) 300μm (C) 3nm (30A∘ Arrange these radiations in the increasing order of their energies.
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Nov
Wavelengths of different radiations are given below: (A) 300nm (B) 300μm (C) 3nm (30A∘ Arrange these radiations in the increasing order of their energies. Wavelengths of different radiations are given below: (A) 300nm (B) 300μm (C) 3nm (30A∘ Arrange these radiations in the increasing order of their energies. November 12, 2020 Category: Chapter 2 - [...]
Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals :
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Nov
Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals : identify the pairs of electrons present in degenerate orbitals : Out of the following pairs of electrons November 12, 2020 Category: Chapter 2 - Atomic Structure , Chemistry , NCERT Exemplar Class 11 ,