Dual nature of radiation and matter practice · Mixed difficulty

Assertion: Photoelectric effect is seen only when electron are bound.

Reason: Free electron cannot absorb whole energy of photon and consuming momentum and energy.

An electron and a neutron can have same (1) kinetic energy, (2) momentum, or (3) speed. Which particle has a shorter de-Broglie wavelength?

The electrons are emitted in the photoelectric effect from a metal surface

If the surface of a metal is successfully exposed to radiation of $\lambda_1=350 \mathrm{~nm}$ and $\lambda_2=450 \mathrm{~nm}$ the maximum velocity of photoelectrons will differ by a factor 2. The work function of this metal is:

The wavelength of the matter waves is independent of

Find the de-Broglie wavelength for electrons which passed through a potential difference of 100 V ? $\left[ {h = 6.625 \times {{10}^{ - 34}}J - \sec } \right]$

When subjected to a transverse electric field, cathode rays move

$e/m$ ratio of anode rays produced in a discharge tube, depends on the

The work function of a substance is $3.0 \mathrm{~eV}.$ The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

The threshold frequency of a metal with work function $6.63 \mathrm{~eV}$ is:

If $V$ be the accelerating voltage, then the maximum frequency of continuous $X$-rays is given by

An $\alpha$ particle and a proton are accelerated from rest through the same potential difference. The ratio of linear momenta acquired by above two particles will be:

When UV light of wavelength $300 \mathrm{~nm}$ is incident on the metal surface having work function $2.13 \mathrm{~eV}$, electron emission takes place. The stopping potential is : $($ Given $\mathrm{hc}=1240 \mathrm{~eV} \mathrm{~nm})$

According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum

The de-Broglie wavelength is proportional to

The de-Broglie wavelength associated with the particle of mass $m$ moving with velocity $v$ is

Light of wavelength 500 nm is incident on a metal surface with work function 2.28 eV. Maximum kinetic energy of emitted electron is

How many photons are emitted by a laser source of $5 \times {10^{ - 3}}\;\mathrm{W}$ operating at 632.2 nm in 2s?

Photons emitted in transition of electrons from n = 2 to n = 1 in hydrogen atom is made to fall on a metal surface with work function 1.2 eV. The maximum velocity of photoelectron emitted is nearly equal to

From the following, what charges can be present on oil drops in Millikan’s experiment

(Here $e$ is the electronic charge)

The de-Broglie wavelength associated with a particle moving with momentum $\left( p \right)$ and mass $\left( m \right)$ is

In photoelectric effect if the intensity of light is doubled, then maximum kinetic energy of photoelectrons will become

Electric field and magnetic field in Thomson mass spectrograph are applied

Assertion: Photo electric current increases if the distance between cathode and anode is increased.

Reason: Momentum of photon is directly proportional to its wavelength.

In a photoelectric effect experiment a light of
frequency 1.5 times the threshold frequency is
made to fall on the surface of photosensitive
material. Now if the frequency is halved and
intensity is doubled, the number of photo electrons
emitted will be

In a photoemissive cell with exciting wavelength $\lambda ,$ the fastest electron has speed $v.$ If the exciting wavelength is changed to $3\lambda /4,$ the speed of the fastest emitted electron will be

$\alpha -$ particle contain –

Consider the two following statements I and II, and identify the correct choice given in the answers

III. In photovoltaic cells the photoelectric current produced is not proportional to the intensity of incident light.

IV. In gas filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.

Which of the following phenomena does not explain by wave nature of light.

(A) reflection $\quad$(B) diffraction

(C) photoelectric effect$\quad$ (D) interference$\quad$(E) polarization

Choose the most appropriate answer from the options given below :

Assertion: The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.

Reason: The work function of the metal is its characteristics property.