Physics-
General
Easy
Question
An electron and a photon have same wavelength. If P is the momentum of electron and E is the energy of photon. The magnitude of P/E is SI unit is
The correct answer is:
(electron)
or 
and 
Related Questions to study
Physics-
Moseley’s law for characteristic X-rays is √v=a (Z-b) null. In this,
Moseley’s law for characteristic X-rays is √v=a (Z-b) null. In this,
Physics-General
Physics-
In an experiment of photo-electric effect, singly ionized ‘He’ is excited electronically to different energy levels. The emission spectra of the He hence produced is made incident on a photoelectric plate in the photo-cell. When He is excited to fourth energy level then the observed stopping potential of photo –cell is found to be five times the stopping potential when hydrogen is excited to third energy level. The work function of the material of the photo electric plate is
In an experiment of photo-electric effect, singly ionized ‘He’ is excited electronically to different energy levels. The emission spectra of the He hence produced is made incident on a photoelectric plate in the photo-cell. When He is excited to fourth energy level then the observed stopping potential of photo –cell is found to be five times the stopping potential when hydrogen is excited to third energy level. The work function of the material of the photo electric plate is
Physics-General
Physics-
Moseley’s law for characteristic X-rays is √v=a (Z-b) null. In this,
Moseley’s law for characteristic X-rays is √v=a (Z-b) null. In this,
Physics-General
Physics-
Suppose the potential energy between electron and proton at separation 
is given by 
, where 
is a constant for such a hypothetical hydrogen atom, the energy of nth level is
Suppose the potential energy between electron and proton at separation is given by , where is a constant for such a hypothetical hydrogen atom, the energy of nth level is
Physics-General
Physics-
The de-Broglie wavelength of a electron is same as the wavelength of an photon. The K.E. of photon is 
times the K.E. of the electron, then is (M – mass of electron, h - Planck’s constant, C - Velocity of light)
The de-Broglie wavelength of a electron is same as the wavelength of an photon. The K.E. of photon is times the K.E. of the electron, then is (M – mass of electron, h - Planck’s constant, C - Velocity of light)
Physics-General
Chemistry-
When the pressure is considerably high, Vm will be quite small. The pressure correction 
may become negligible and van der Waal’s equation reduces to
P (Vm – nb) = nRT
This explains why the PVm, after reaching a minimum value, increases with increase in pressure. For a real gas, PV versus P plot is not linear. Hence r/P or m/PV is not independent of P,. For calculation of r and molecular mass M, we must obtain r/P at P =0. As P ® 0,
P(V – nb) = nRT
Þ 
\ 
The nature of graph plotted for P on x-axis versus r/P on y-axis will be:
When the pressure is considerably high, Vm will be quite small. The pressure correction may become negligible and van der Waal’s equation reduces to
P (Vm – nb) = nRT
This explains why the PVm, after reaching a minimum value, increases with increase in pressure. For a real gas, PV versus P plot is not linear. Hence r/P or m/PV is not independent of P,. For calculation of r and molecular mass M, we must obtain r/P at P =0. As P ® 0,
P(V – nb) = nRT
Þ
\
The nature of graph plotted for P on x-axis versus r/P on y-axis will be:
Chemistry-General
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As per given figure to complete the circular loop what should be the radius if initial height is 5 m :
As per given figure to complete the circular loop what should be the radius if initial height is 5 m :
Physics-General
Physics-
A block follows the path as shown in the figure from height h. If radius of circular path is r, then relation that holds good to complete full circle is :
A block follows the path as shown in the figure from height h. If radius of circular path is r, then relation that holds good to complete full circle is :
Physics-General
Physics-
A particle originally at rest at the highest point of a smooth vertical circle is slightly displaced. It will leave the circle at a vertical distance h below the highest point such that:
A particle originally at rest at the highest point of a smooth vertical circle is slightly displaced. It will leave the circle at a vertical distance h below the highest point such that:
Physics-General
Physics-
Three identical particles are joined together by a thread as shown in figure. All the three particles are moving in a horizontal plane. If the velocity of the outermost particle nullthen the ratio of tensions in the three sections of the string is :
Three identical particles are joined together by a thread as shown in figure. All the three particles are moving in a horizontal plane. If the velocity of the outermost particle nullthen the ratio of tensions in the three sections of the string is :
Physics-General
Physics-
In 1.0s, a particle goes from point A to point B, moving in a semicircle of radius 1.0 m (figure). The magnitude of the average velocity is :
In 1.0s, a particle goes from point A to point B, moving in a semicircle of radius 1.0 m (figure). The magnitude of the average velocity is :
Physics-General
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What happens to the centripetal acceleration of a revolving body if you double the orbital speed u and half the angular velocity w :
What happens to the centripetal acceleration of a revolving body if you double the orbital speed u and half the angular velocity w :
Physics-General
Physics-
Which of the following statements is false for a particle moving in a circle with a constant angular speed:
Which of the following statements is false for a particle moving in a circle with a constant angular speed:
Physics-General
Chemistry-
Which one of the following exhibits geometrical isomerism
Which one of the following exhibits geometrical isomerism
Chemistry-General
Chemistry-
Only two isomers of monochloro product is possible of
Only two isomers of monochloro product is possible of
Chemistry-General
