Which phenomena help form Earth’s magnetic field? Check all that apply. weather on Earth’s surface rotation of Earth on its axis
2 answers:
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Answer:
Planck’s constant is
work function of metal is
Explanation:
The maximum kinetic energy from electron from photoelectric effect is given by
where
is applied voltage and e is charge on electron and substituting charge on electron by
and 1.00 V for
Considering that the wavelength, \lambda of light used is given as
Energy of light is given by
where
is the wavelength, h is Planck’s constant and c is speed of light. Taking c for
Substituting values of wavelength and speed of light we obtain
If work function is then
hence
------- Equation 1
Energy corresponding to wavelength of 207 nm is
Maximum kinetic energy of electrons when is 2.6 V becomes
From and substituting
for E and
for
we have
------ Equation 2
Equation 2 minus equation 1 gives
Therefore, Planck’s constant is
Recalling equation 1 and substituting back the value of h as obtained
Therefore, work function of metal is