91影视

#tag_title#Step 2: Calculate the work function#tag_content# Now that we have the threshold frequency, we can calculate the work function using the Planck-Einstein relation. The work function (桅) is given by 桅 = h 脳 谓_threshold, where h is the Planck's constant (6.63 脳 10鈦宦斥伌 Js) and 谓_threshold is the threshold frequency. Calculate the work function: $$\Phi = h \cdot \nu_{threshold}$$ #tag_title#Step 3: Find the maximum kinetic energy#tag_content# We have to find the maximum kinetic energy of the electrons when the incident light has a wavelength of 140 nm. Given wavelength: 位 = 140 nm = 140 脳 10鈦烩伖 m First, we need to find the frequency (谓) of the incident light: $$\nu = \frac{c}{\lambda}$$ Next, we will use the photoelectric equation to find the maximum kinetic energy (K_max): $$K_{max} = h \cdot \nu - \Phi$$ Now, we can plug in all the known values and calculate the maximum kinetic energy (K_max).