SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

Surface of certain metal is first illuminated with light of wavelength 1=350mm and then, by light of wavelength 2=54Dmm, it is found that the maximum speed of the photon electrons in the two cases differ by a factor of 2.  The work function of the metal (in eV) is close to:

(Energy of photon= eV)

a.

1.8

b.

1.4

c.

2.5

d.

5.6


Question ID - 50062 :-

Surface of certain metal is first illuminated with light of wavelength 1=350mm and then, by light of wavelength 2=54Dmm, it is found that the maximum speed of the photon electrons in the two cases differ by a factor of 2.  The work function of the metal (in eV) is close to:

(Energy of photon= eV)

a.

1.8

b.

1.4

c.

2.5

d.

5.6

1 Answer
5876 Votes
3537

Answer Key : (a) -

= + (2v)2

= + mv2

  = 4

  =3

  =

= 1240

=1.8 eV



Next Question :

The area of a right-angled triangle is 40 times its base. What is its height? 

(a)

45 cm

(b)

60 cm

(c)

80 cm

(d)

Data inadequate


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