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In a photoelectric  effect  experiment the threshold wavelength of light is 380nm.If the wavelength of incident light is 260nm, the maximum kinetic energy of emitted electrons will be: Given  E (in eV)=

(a)

4.5eV

(b)

15.1eV

(c)

3.0eV

(d)

1.5eV


Question ID - 51323 :-

In a photoelectric  effect  experiment the threshold wavelength of light is 380nm.If the wavelength of incident light is 260nm, the maximum kinetic energy of emitted electrons will be: Given  E (in eV)=

(a)

4.5eV

(b)

15.1eV

(c)

3.0eV

(d)

1.5eV

1 Answer
5876 Votes
3537

Answer Key : (d) -

Wavelength of incident waves

Cut off (threshold)wavelength  =380nm

Then     

K =

=1237

= = 1.5eV



Next Question :

In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.

One may conclude that:

(a)

R(T)=

(b)

R(T)=R0

(c)

R(T)=R0

(d)

R(T)=R0


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