# In a Frank−Hertz experiment, an electron of energy 5.6 eV passes through mercury vapor and emerges with energy 0.7 eV. The minimum wavelength of photons emitted by mercury atoms is close to : (a) 2020 nm (b) 220nm (c) 250nm (d) 1700nm

## Question ID - 50866 :- In a Frank−Hertz experiment, an electron of energy 5.6 eV passes through mercury vapor and emerges with energy 0.7 eV. The minimum wavelength of photons emitted by mercury atoms is close to : (a) 2020 nm (b) 220nm (c) 250nm (d) 1700nm

3537

Answer Key : (c) -

= 250 nm.

Next Question :

In a class with certain number of students, if one student weighing 50 kg is added then the average weight of the class increases by 1 kg. If one more student weighing 50 kg is added, then the average weight of the class increases by 1.5 kg over the original average. What is the original average weight (in kg) of the class?

(a)    2                              (b)    4                                  (c)    46                        (d)    47