The value of Planck’s constant is 6.63 × 10-34 J s. The velocity of light is 3.0 × 108 m s-1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 1015 s-1?

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The value of Planck’s constant is 6.63 × 10^-34 J s. The velocity of light is 3.0 × 10⁸ m s^-1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 10¹⁵ s^-1?

5 × 10 s^-18

4 × 10

3 × 10⁷

2 × 10s^-25

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The work function (ϕ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is

Metal	Li	Na	K	Mg	Cu	Ag	Fe	Pt	W
ϕ(eV)	2.4	2.3	2.2	3.7	4.8	4.3	4.7	6.3	4.75

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