The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then base current is
0.35 mA
0.28 mA
0.39 ma
0.43 mA
Photoelectric effect supports quantum nature of light because
there is minimum frequency of light below which no photoelectrons are emitted
the maximum energy of photoelectron depends only on the frequency of light and not on its intensity
photoelectric effect is an instantaneous process
all the above choices are correct
D.
all the above choices are correct
The three experimental facts listed under (a), (b) and (c) cannot be explained on the basis of wave theory of light. All these facts support the quantum (photon) nature of light.
Assertion: In optical fibre, the diameter of the core is kept small.
Reason: The smaller diameter of the core ensures that the fibres should have incident angle more than the critical angle required for total internal reflection.
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: A p-n junction with reverse bias can be used as a photo-diode to measure light intensity.
Reason: In a reverse bias condition the current is small but it is more sensitive to change in intensity of incident light.
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: The output voltage and the input voltage of the NOT gate have 180° phase difference.
Reason: The logic NOT can be built using diode.
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: In a common emitter transistor amplifier, the input current is much less than the output current than output impedance.
Reason: The common emitter transistor amplifier has higher input impedance than output impedance.
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: In a common emitter transistor amplifier, the input current is much less than the output current than output impedance.
Reason: The common emitter transistor amplifier has higher input impedance than output impedance.
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: If a heavy nucleus is split into two medium-sized parts, each of the nuclei will have more binding energy per nucleon than the original nucleus.
Reason: Joining two light nuclei together to give a single nucleus of medium size means more binding energy per nucleon than the two nucleus.
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: The frequencies of incident, reflected and refracted beam of monochromatic light passing from one medium to another are the same.
Reason: The incident, the reflected and refracted rays are coplanar.
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: A secondary rainbow have inverted colours than the primary rainbow.
Reason: The secondary rainbow is formed by single total internal reflection.
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.