JEE Mains Physics 2002-2019 Solved Video Solutions
A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by 52 K, its efficiency is doubled. The temperature in Kelvin of the source will be _________.
26
Sep
A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by 52 K, its efficiency is doubled. The temperature in Kelvin of the source will be _________. A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink [...]
The wavelength of an X-ray beam is 10Å. The mass of a fictitious particle having the same energy as that of the X-ray photons is x/3 h kg. The value of x is_________. (h = Planck’s constant)
26
Sep
The wavelength of an X-ray beam is 10Å. The mass of a fictitious particle having the same energy as that of the X-ray photons is x/3 h kg. The value of x is_________. (h = Planck’s constant) The wavelength of an X-ray beam is 10Å. The mass of a fictitious particle having the same energy [...]
The initial velocity vi required to project a body vertically upward from the surface of the earth to reach a height of 10R, where R is the radius of the earth, may be described in terms of escape velocity ve such that v i = √ x/y × v e. The value of x will be ________.
26
Sep
The initial velocity vi required to project a body vertically upward from the surface of the earth to reach a height of 10R, where R is the radius of the earth, may be described in terms of escape velocity ve such that v i = √ x/y × v e. The value of x will [...]
Two small spheres each of mass 10 mg are suspended from a point by threads 0.5 m long. They are equally charged and repel each other to a distance of 0.20 m. The charge on each of the sphere is a / 21 × 10^− 8 C. The value of ‘a’ will be ______. [Given g = 10 ms^–2]
26
Sep
Two small spheres each of mass 10 mg are suspended from a point by threads 0.5 m long. They are equally charged and repel each other to a distance of 0.20 m. The charge on each of the sphere is a / 21 × 10^− 8 C. The value of ‘a’ will be ______. [Given [...]
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 mm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that :
26
Sep
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 mm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that : Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 mm. If the diameter of the [...]
Match List I and List II. Choose the correct answer from the options given below :
26
Sep
Match List I and List II. Choose the correct answer from the options given below : Match List I and List II. Choose the correct answer from the options given below : September 26, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,
The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the incident wavelength is changed to a new value, the stopping potential is 1.43 V. The new wavelength is :
26
Sep
The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the incident wavelength is changed to a new value, the stopping potential is 1.43 V. The new wavelength is : The stopping potential for electrons emitted from a photosensitive surface illuminated by light of [...]
An electron with kinetic energy K1 enters between parallel plates of a capacitor at an angle ‘a’ with the plates. It leaves the plates at angle ‘b’ with kinetic energy K2. Then the ratio of kinetic energies K1 : K2 will be :
26
Sep
An electron with kinetic energy K1 enters between parallel plates of a capacitor at an angle ‘a’ with the plates. It leaves the plates at angle ‘b’ with kinetic energy K2. Then the ratio of kinetic energies K1 : K2 will be : The logic circuit shown above is equivalent to : September 26, 2021 [...]
The truth table for the following logic circuit is :
26
Sep
The truth table for the following logic circuit is : The truth table for the following logic circuit is : September 26, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,
If e is the electronic charge, c is the speed of light in free space and h is Planck’s constant, the quantity 1/4πε0 |e|^2/hc has dimensions of
26
Sep
If e is the electronic charge, c is the speed of light in free space and h is Planck’s constant, the quantity 1/4πε0 |e|^2/hc has dimensions of c is the speed of light in free space and h is Planck's constant If e is the electronic charge the quantity 1/4πε0 |e|^2/hc has dimensions of September [...]