Question

11. The current in the circuit for Platinum at 100% intensity, 100nm wavelength, and zero battery voltage is __________ Amps.

12. he current in the circuit for Platinum at 100% intensity, 200nm wavelength, and zero battery voltage is __________ Amps.

13. The current in the circuit for Calcium at 100% intensity, 100nm wavelength, and zero battery voltage is __________ Amps.

14. The current in the circuit for Calcium at 100% intensity, 200nm wavelength, and zero battery voltage is __________ Amps.

15. The current in the circuit for Calcium at 100% intensity, 300nm wavelength, and zero battery voltage is __________ Amps.

16. The current in the circuit for Calcium at 100% intensity, 400nm wavelength, and zero battery voltage is __________ Amps.

Answer 1

Maximum Kinetic eney of electron(K.E)

K.E​​​​max = E - work function

E = hc/wavelength

E(eV) = 1240/(wavelength in nm)

Photocurrent(I)

=( Intensity* conversion efficiency)/

The number of photons incident on the plate per second (called photon flux) is given by

Φ = I/ E = [intensity / hf]

If f > f0 (threshold frequency) and photon efficiency of the metal plate is η%, then the number of photoelectrons emitted per second is given by

n = (Φη/100)

Finally, the photocurrent i is given by

i = ne

Where e is the charge of an electron (e = 1.6 × 10–19 J)

(11). 0.8Amps

K.E​​​max = (1240/100) - 6.35

= 6.05eV

i.e K.E is positive which mean there is ejection of electron from metal surafce.

i = (1/12.4*1.6* 10-19)*1.6*10^-19

= 0.08Amps

(12) 0 Amps

K.E​​​max = (1240/200) - 6.35

= -0.15eV

i.e K.E is negative so no photo current.

Similarly we can calculate for others