A transistor connected at common emitter mode contains load resistance of 5 kΩ and an input resistance of 1 kΩ. If the input peak voltage is 5 mV and the current gain is 50, find the voltage gain.
250
500
125
50
The two coherent sources with intensity ratio β produce interference. The fringe visibility will be
2 β
A.
= β
∴
Imax = ( a + b )2 and Imin = ( a b )2
Fringe visibility is given by
V =
=
V =
V =
V =
For a situation shown in figure, find the refrective index of glass so that it will suffer total internal reflection at the vertical surface
1.732
1.5
1.31
1.6
Assertion: In YDSE bright and dark fringe are equally spaced.
Reason: It only depends upon phase difference.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Generally heavy nuclei are unstable.
Reason: It has more neutrons and protons.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
Assertion: Electron microscope has more resolving power than optical microscope.
Reason: We can control the energy of electron.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: When a certain wavelength of light fall on a metal surface it ejects electron.
Reason: Light has wave nature.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Electrons in the atom are held due to Coulomb forces.
Reason: The atom is stable only because the centripetal force due to Coulomb's law is balanced by the centrifugal force.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: When an object is placed between two plane parallel mirrors, then all the images found are of equal intensity.
Reason : In case of plane parallel mirrors, only two images are possible.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.