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The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einsteins equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are (a) None (b) A only (c) A and B only (d) All three metals


The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einsteins equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are


        (a)    None


        (b)    A only


        (c)    A and B only      


(d)    All three metals


Grade:10

5 Answers

Aditi Chauhan
askIITians Faculty 396 Points
7 years ago

(a)

100 g will become 25 g in two half lives so it is 3200 years.

Aditi Chauhan
askIITians Faculty 396 Points
7 years ago

So, only metals having work function less than 3eV can emit photoelectrons for the incident radiation of wavelength 4100 Å.

Madhukar Thalore
58 Points
7 years ago

we know that E=hc/lambda

now from given data 1eV=1-6*10^-19 J.

now find E value(which will be 3eV) and those having (A,B,C) energy greater than E will show.

Answer is (c) A and B only.

Varun Acharya
39 Points
7 years ago
c
mohammad
39 Points
7 years ago
answer is (c)

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