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LekaFEV [45]
3 years ago
14

Nearly all the light that strikes an opaque object will pass through and cast a shadow

Physics
2 answers:
ahrayia [7]3 years ago
8 0

Answer:

It’s a false statement.

Explanation:

An object which does not allow to pass light through is called as opaque object. It creates a shadow when light falls on it.  While transparent object does allow to pass light though it and does not create shadow. From the above definitions, it is cleared that the given statement is false.

k0ka [10]3 years ago
5 0
I'm pretty sure the answer is false
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3 0
3 years ago
When light of wavelength 240 nm falls on a potassium surface, electrons having a maximum kinetic energy of 2.93 eV are emitted.
olchik [2.2K]

A) We want to find the work function of the potassium. Apply this equation:

E = 1243/λ - Φ

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E = 2.93eV, λ = 240nm

Plug in and solve for Φ:

2.93 = 1243/240 - Φ

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B) We want to find the threshold wavelength, i.e. find the wavelength such that the energy E of the photoelectrons is 0eV. Plug in E = 0eV and Φ = 2.25eV and solve for the threshold wavelength λ:

E = 1243/λ - Φ

0 = 1243/λ - Φ

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Given values:

c = 3×10⁸m/s, λ = 5.52×10⁻⁷m

Plug in and solve for f:

3×10⁸ = f(5.52×10⁻⁷)

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