EASY
CUET (UG)
IMPORTANT
Earn 100

According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

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Important Questions on Dual Nature of Radiation and Matter

EASY
CUET (UG)
IMPORTANT
Which one of the following is true in photoelectric emission?
EASY
CUET (UG)
IMPORTANT
Photoelectric effect takes place in element A. Its work function is 2.5 eV and threshold wavelength is λ. Another element B has work function of 5 eV. Then, find out the wavelength that can produce photoelectric effect in B.
EASY
CUET (UG)
IMPORTANT
The idea of the quantum nature of light has emerged in an attempt to explain
EASY
CUET (UG)
IMPORTANT
Find the maximum kinetic energy of the photo electron liberated from the surface of lithium by electromagnetic radiation whose electric component varies with time as

E=a1+cosωtcosωot, where a is a constant, ω=6×1014 s-1 and ωo=3.6×1015 s-1, work function of lithium, φ=2.39 eV
EASY
CUET (UG)
IMPORTANT
The number of photons of frequency v present in energy E is:
EASY
CUET (UG)
IMPORTANT

Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions ϕp=2.0eV,ϕa=2.5eV and ϕr=3.0eV respectively, A light beam containing wavelength of 550nm, 450nm and 350nm with equal intensities illuminates each of the plates. The correct I-V graph for the experiment is, see Fig. 19.15 

EASY
CUET (UG)
IMPORTANT

Sodium and copper have work function 2.3 eV and 4.5 eV respectively. Then, the ratio of the wavelength is nearest to:

 

MEDIUM
CUET (UG)
IMPORTANT
A beam of light of intensity I is normally incident on a plate of area A. If plate absorbs fraction η of incident light and reflects rest of it back, then the force exerted by the incident light on the plate is given by [c=speed of light]