Physics-
General
Easy
Question
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 correct answer is:
Energy of photon, 
And energy of electron = 
But 
Related Questions to study
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
Physics-
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
Physics-
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
Physics-
Assertion : Displacement of a body may be zero when distance travelled by it is not zero.
Reason : The displacement is the longest distance between initial and final position.
Assertion : Displacement of a body may be zero when distance travelled by it is not zero.
Reason : The displacement is the longest distance between initial and final position.
Physics-General
Chemistry-
meso-Tartaric acid is optically inactive due to the presence of
meso-Tartaric acid is optically inactive due to the presence of
Chemistry-General
Chemistry-
Examine the followings two structures for the anilinium ion and choose the correct statement from the ones given below
I) 
II) 
Examine the followings two structures for the anilinium ion and choose the correct statement from the ones given below
I)
II)
Chemistry-General
Physics-
Assertion : The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval.
Reason : Velocity is a vector quantity and speed is a scalar quantity.
Assertion : The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval.
Reason : Velocity is a vector quantity and speed is a scalar quantity.
Physics-General
Chemistry-
The compound which gives the most stable carbonium ion on dehydration is :
The compound which gives the most stable carbonium ion on dehydration is :
Chemistry-General
