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Yellow light emitted from a sodium lamp has a wavelength (λ) of 580nm. Calculate the frequency (v) and the wave number (v¯) of the yellow light
12
Nov
Yellow light emitted from a sodium lamp has a wavelength (λ) of 580nm. Calculate the frequency (v) and the wave number (v¯) of the yellow light Yellow light emitted from a sodium lamp has a wavelength (λ) of 580nm. Calculate the frequency (v) and the wave number (v¯) of the yellow light November 12, 2020 [...]
(i) Calculate the total number of electrons present in 1 mole of methane . (ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of .14C. (Assume that mass of a neutron =1.675×10^−27g)
12
Nov
(i) Calculate the total number of electrons present in 1 mole of methane . (ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of .14C. (Assume that mass of a neutron =1.675×10^−27g) identify the pairs of electrons present in degenerate orbitals : Out of the following pairs of [...]
(i) Calculate the number of electrons which will together with one gram . (ii) Calculate the mass and charge on one mole of electrons .
12
Nov
(i) Calculate the number of electrons which will together with one gram . (ii) Calculate the mass and charge on one mole of electrons . (i) Calculate the number of electrons which will together with one gram . (ii) Calculate the mass and charge on one mole of electrons . November 12, 2020 Category: Chapter [...]
Why was a change in the Bohr Model of atom required ? Due to which important development (s), concept of movement of an electron in an orbit was replaced by the concept of probability of finding electron in an orbital ? What is the name given to the changed model of atom?
12
Nov
Why was a change in the Bohr Model of atom required ? Due to which important development (s), concept of movement of an electron in an orbit was replaced by the concept of probability of finding electron in an orbital ? What is the name given to the changed model of atom? concept of movement [...]
Calculate the energy and frequency of the radiation emitted when an electron jumps from n=3 to n=2 in a hydrogen atom.
12
Nov
Calculate the energy and frequency of the radiation emitted when an electron jumps from n=3 to n=2 in a hydrogen atom. Calculate the energy and frequency of the radiation emitted when an electron jumps from n=3 to n=2 in a hydrogen atom. November 12, 2020 Category: Chapter 2 - Atomic Structure , Chemistry , NCERT [...]
When an electric discharge is passed through hydrogen gas, the hydrogen molecules dissociate to produce excited hydrogen atoms. These excited atoms emit electromagnetic radiation of discrete frequencies which can be given by the general formula v¯=109677[1/n2i−1/nf2] What points of Bohr’s model of an atom can be used to arrive at this formula ? Based on these points derive the above formula giving description of each step and each term.
12
Nov
When an electric discharge is passed through hydrogen gas, the hydrogen molecules dissociate to produce excited hydrogen atoms. These excited atoms emit electromagnetic radiation of discrete frequencies which can be given by the general formula v¯=109677[1/n2i−1/nf2] What points of Bohr’s model of an atom can be used to arrive at this formula ? Based on [...]
A tuning fork vibrating with a frequency of 512 Hz is kept close to the open end of a tube filled with water , figure. The water level in the tube is gradually lowered. When the water level is 17cm below the open end, maximum intensity of sound in heard. If the room temperature is 20∘C, calculate (a) speed of sound in air at room temperature. (b) speed of sound in air at 0∘C (c) if the water in the tube is replaced with mercury, will there be any difference in your observations?
12
Nov
A tuning fork vibrating with a frequency of 512 Hz is kept close to the open end of a tube filled with water , figure. The water level in the tube is gradually lowered. When the water level is 17cm below the open end, maximum intensity of sound in heard. If the room temperature is [...]
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A tuning fork vibrating with a frequency of 512 Hz is kept close to the open end of a tube filled with water ,
calculate (a) speed of sound in air at room temperature. (b) speed of sound in air at 0∘C (c) if the water in the tube is replaced with mercury ,
figure. The water level in the tube is gradually lowered. When the water level is 17cm below the open end ,
maximum intensity of sound in heard. If the room temperature is 20∘C ,
will there be any difference in your observations? ,
The pattern of standing waves formed on a stretched string at two instants of time are shown of time are shown in figure. The velocity of two waves superimposing to form stationary waves is 360ms−1 and their frequencies are 256 Hz.
12
Nov
The pattern of standing waves formed on a stretched string at two instants of time are shown of time are shown in figure. The velocity of two waves superimposing to form stationary waves is 360ms−1 and their frequencies are 256 Hz. At what temperature will the speed of sound in air be 3 times its [...]
The wave pattern on a stretched string is shown in figure. Interpret what kind of wave is this and find its wavelength?
12
Nov
The wave pattern on a stretched string is shown in figure. Interpret what kind of wave is this and find its wavelength? The wave pattern on a stretched string is shown in figure. Interpret what kind of wave is this and find its wavelength? November 12, 2020 Category: Chapter 14 - Waves , NCERT Exemplar [...]
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 [...]