JEE Mains Physics 2002-2019 Solved Video Solutions
When photons of energy 4.25 eV strike the surface of a metal A, the ejected photoelectrons have maximum kinetic energy TA expressed in eV and de-Broglie wavelength λA. The maximum kinetic energy of photoelectrons liberated from another metal B by photons of energy 4.70 eV is TB=(TA−1.50eV). If the de-Broglie wavelength of these photoelectrons is λB=2λA, then
15
Sep
When photons of energy 4.25 eV strike the surface of a metal A, the ejected photoelectrons have maximum kinetic energy TA expressed in eV and de-Broglie wavelength λA. The maximum kinetic energy of photoelectrons liberated from another metal B by photons of energy 4.70 eV is TB=(TA−1.50eV). If the de-Broglie wavelength of these photoelectrons is [...]
In an n-p-n transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector
15
Sep
In an n-p-n transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector In an n-p-n transistor circuit the collector current is 10 mA. If 90% of the electrons emitted reach the collector September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 [...]
When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are respectively 0.6 V and 18.0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then
15
Sep
When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are respectively 0.6 V and 18.0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then the cut off voltage and the saturation current are [...]
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation
15
Sep
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation in the emitted radiation The potential difference applied to an X -ray tube is increased. As a result September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 Solved Video Solutions ,
From the following equations pick out the possible nuclear fusion reactions
15
Sep
From the following equations pick out the possible nuclear fusion reactions From the following equations pick out the possible nuclear fusion reactions September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 Solved Video Solutions ,
The threshold wavelength for photoelectric emission from a material is 5200A˚. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a
15
Sep
The threshold wavelength for photoelectric emission from a material is 5200A˚. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a The threshold wavelength for photoelectric emission from a material is 5200A˚. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a September 15, 2021 Category: Chapter [...]
A photoelectric material having work-function ϕ0 is illuminated with light of wavelength λ(λ is smaller then hc/ϕ0). The fastest photoelectron has a de Broglie wavelength λd. A change in wavelength of the incident light by Δλ results in a change Δλd in λd. Then the ratio Δλd/Δλ is proportional to
15
Sep
A photoelectric material having work-function ϕ0 is illuminated with light of wavelength λ(λ is smaller then hc/ϕ0). The fastest photoelectron has a de Broglie wavelength λd. A change in wavelength of the incident light by Δλ results in a change Δλd in λd. Then the ratio Δλd/Δλ is proportional to Beta rays emitted by a [...]
An accident in a nuclear laboratory resulted in deposition of a certain amount of radioactive material of half-life 18 days inside the laboratory. Tests revealed that the radiation was 64 times more than the permissible level required for safe operation of the laboratory. What is the minimum number of days after which the laboratory can be considered safe for use?
15
Sep
An accident in a nuclear laboratory resulted in deposition of a certain amount of radioactive material of half-life 18 days inside the laboratory. Tests revealed that the radiation was 64 times more than the permissible level required for safe operation of the laboratory. What is the minimum number of days after which the laboratory can [...]
In a historical experiment to determine Planck’s constant, a metal surface was irradiated with light of different wavelengths. The emitted photoelectron energies were measured by applying a stopping potential. The relevant data for the wavelength (lambda). ) of incident light and the corresponding stopping potential (V_0 ) are given below
15
Sep
In a historical experiment to determine Planck’s constant, a metal surface was irradiated with light of different wavelengths. The emitted photoelectron energies were measured by applying a stopping potential. The relevant data for the wavelength (lambda). ) of incident light and the corresponding stopping potential (V_0 ) are given below Beta rays emitted by a [...]
If λcu is the wavelength of Kα, Xray line of copper (atomic number 29) and λMO is the wavelength of the Kα, Xray line of molybdenum (atomic number 42), then the ratio λCu/λMo is close to
15
Sep
If λcu is the wavelength of Kα, Xray line of copper (atomic number 29) and λMO is the wavelength of the Kα, Xray line of molybdenum (atomic number 42), then the ratio λCu/λMo is close to If λcu is the wavelength of Kα then the ratio λCu/λMo is close to Xray line of copper (atomic [...]