Light of frequency 7.21xx10^(14)Hz is in...

Light of frequency `7.21xx10^(14)Hz` is incident on a metal surface. Electrons with a maximum speed of `6.0xx10^(5)ms^(-1)` are ejected from the surface. What is the threshold frequency for photoemission of electrons? `h=6.63xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg`.

`4.74 xx10^(14)Hz`

`5.74xx10^(15)Hz`

`6.84xx10^(13)Hz`

`4.84xx10^(14)Hz`

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(a) A 100 W sodium Lamp radiates energy uniformly in all directions. The Lamp is located at the centre of a large sphere , that absorbs all the sodium of a large sphere , that absorbs all the sodium light which is incident on it . The wavelength of the sodium light is 589 nm (i) What is the energy associated per photon with the sodium light ? (ii) At what rate are the photons delivered to the sphere ? (b) Light of frequency 7.21 xx10^(14) Hz is incident on a metal surface . Electrons with a maximum speed of 6.0xx10^(5) ms^(-1) are ejected from the surface What is the threshold frequency for photo emission of electron ? Given , h= 6.63xx10^(-34) Js , m_c=9.1xx10^(-310 Kg

An electron is moving in a cyclotron at a speed of 3.2 xx 10^(7) m s^(-1) in a magnetic field of 5 xx 10^(-4) T perpendicular to it. What is the frequency of this electron? (q=1.6xx10^(-19)C, m_(c)=9.1xx10^(-31)kg)

A metal whose work function is 3.3eV is illuminated by light of wavelength 3 xx 10^(-7)m . What is the threshold frequency for photoelectric emission? Plank's constant = 6.6 xx 10^(-34) Js?

If photoelectrons are to be emitted from a potassium surface with a speed of 6 xx 10^(6)ms^(-1) , what frequency of radiation must be used ? (Threshold frequency for potassium is 4.22 xx 10^(14) Hz, h = 6.6 xx 10^(-34) Js and m_(e) = 9.1 xx 10^(-31) kg )

Calculate the energy of an electron having de-Broglie wavelength 5500Å. Given, h=6.62xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg .

If an electron has an energy such that its de Broglie wavelength is 5500 Å , then the energy value of that electron is (h= 6.6 xx 10^(-34)) Js, m_( c) = 9.1 xx 10^(-31) kg

The maximum wavelength for which an em wave can ejected electrons form a platinum surface is 195 nm. When radiations with a wavelength of 131nm shines on the surface. What is the maximum speed of the ejected electrons? [Use h=6.63xx10^(-34)Js ] m_(e)=9.1xx10^(-31)kg .

A photon of frequency 5 xx 10^(14)Hz is incident on the surface of a metal. What is the energy of the incident photon in eV?

The work function of caesium is 2.14 eV. When light of frequency 6xx10^(14)Hz is incident on the metal surface, photoemission of electrons occurs. What is the (a) maximum kinetic energy of the emitted electrons. (b) stopping potential and (c) maximum speed of the emitted photoelectrons. given , h=6.63xx10^(-34)Js, 1eV=1.6xx10^(-19)J, c=3xx10^(8)m//s .

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