Q3 of 47 Page 1

Define the term “threshold frequency”, in the context of photoelectric emission.

OR


Define the term “Intensity” in photon picture of electromagnetic radiation.


For a given photosensitive material, threshold frequency is the minimum frequency of radiation that is required for photoelectric emission from the material.

OR


Intensity is a measure number of photons passing through a given cross section per unit area.


More from this chapter

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1

Draw the pattern of electric field lines, when a point charge – Q is kept near an uncharged conducting plate.

 2

How does the mobility of electrons in a conductor change, if the potential difference applied across the conductor is doubled, keeping the length and temperature of the conductor constant ?

 4

What is the speed of light in a denser medium of polarising angle 30°?

 5

In sky wave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?

OR


On what factors does the range of coverage in ground wave propagation depend ?