Light of a given wavelength is used to illuminate the surface of metal, however,

Question

Light of a given wavelength is used to illuminate the surface of metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should use light of a longer wavelength. use light of a shorter wavelength. use light of the same wavelength but increase its intensity. use light of the same wavelength but decrease its intensity. If the wavelength of a photon in vacuum is the same as the de Broglie wavelength of an electron, which one is traveling faster through spec? The electron because it has more mass. The photon because photons always travel through space faster than electrons. They both have the same speed. It depends on the density of electrons Protons are being accelerated in a particle accelerator. When the energy of the protons is doubled, their de Broglie wavelength will increase by a factor of 4. increase by a factor of 2. decrease by a factor of 2. increase by a factor of squareroot 2. decrease by a factor of squareroot 2 A proton and an electron are both accelerated to the same final speed. If lambda_p is the de Broglie wavelength of the proton and lambda_e is the de Broglie wavelength of the electron, then lambda_p > lambda_e lambda_p = lambda_e lambda_p

Explanation / Answer

17)B as energy is inversly proportional to wavelength

18)B
19)C
E is invrsly proportnl to wavelength
20)C
As momentum of proton is higher than electron
Wavelength inversly proportional to momentum

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