A metal (M) has a work function of 8.76×10^{−19} J8.76×10 −19 J. When electromagnetic radiation of a particular wavelength is shone upon the metal surface, photoelectrons having a maximum speed of 2.35×10^{6} m/s2.35×10 6 m/s are ejected. What is the wavelength (in nm) of the electromagnetic radiation that struck the metal surface? To what region of the electromagnetic spectrum (UV, visible, IR, etc.) does this correspond?

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

its lower due to the doppler effect.: apex