When yellow light is incident on a surface , no electrons are emitted while green light can emit. If red light is incident on the surface , thenA. No electrons are emittedB. Photons are emittedC. Electrons of higher energy are emittedD. Electrons of lower energy are emitted

When yellow light is incident on a surface , no electrons are emitted

1.	When yellow light is incident on a surface , no electrons are emitted while green light can emit. If red light is incident on the surface , thenA. No electrons are emittedB. Photons are emittedC. Electrons of higher energy are emittedD. Electrons of lower energy are emitted
Answer» Correct Answer - A `lambda_(r) gt lambda_(y) gt lambda_(g)` . Here threshold wavelength `lt lambda_(y)`.

Discussion

No Comment Found

Related InterviewSolutions

The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1MeV energy is nearlyA. `1.2nm`B. `1.2xx10^(-3)nm`C. `1.2xx10^(-6) nm`D. `.12xx10^(1)nm`
Energy of `K` - shell electron be `-40000 eV`. If `60000 V` potential is applied at Coolidge tube then which of the following `X` - rays will get form ?A. ContinuousB. White `X` - raysC. Continuous and all series of characteristicD. None of these
The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1MeV energy is nearlyA. 1.2 nmB. `1.2xx10^(-3)` nmC. `1.2xx10^(-6)`nmD. `1.2xx10` nm
What determines the hardness of the `X` - rays obtained from the Coolidge filament ?A. Current in the filamentB. Pressure of air in the tubeC. Nature of targetD. Potential difference between cathode and target
It is harder to remove free electron from copper than from sodium. Which has higher work function?
What determines the maximum velocity of the photoelectrons?
A photon of wavelength `6630 Å` is incident on a totally reflecting surface . The momentum delivered by the photon is equal toA. `6.63 xx 10^(-27) kg - m//sec`B. `2 xx 10^(-27) kg - m//sec`C. `10^(-27) kg - m//sec`D. None of these
The work function of copper is 4.0 eV. If two photons, each of energy 2.5 eV strike with some electrons of copper, will the emission be possible?
An electron and a photon have same wavelength `lambda`, what is ratio of their kinetic energies ?A. `h/(m_eclambda)`B. `(2m_e clambda)/h`C. `1:1`D. `h/(2m_eclambda)`
The number of photons `(lambda = 6630 Å)` that strike per second on a totoally reflecting screen (as shown in figure), so that a force of `1N` is exerted on the screen, is approximentely). A. `10^23`B. `10^27`C. `10^25`D. `10^26`

When yellow light is incident on a surface , no electrons are emitted while green light can emit. If red light is incident on the surface , thenA. No electrons are emittedB. Photons are emittedC. Electrons of higher energy are emittedD. Electrons of lower energy are emitted

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment