The uncertainty in the positron and momentum can be written as

Light of wave length λ falls on a metal having work function hc/λ_°ree; photoelectric effect will take place only if

Davison and Germer received the Nobel Prize in

Rest mass of photon is

The velocity at which the mass of a body become double is (BWP 2016)

Wave nature of light appears in

In the subatomic world,________ can be predicted with 100% precision

The concept that a particle can behave like waves was given by

We can find from de Broglie formula (RWP 2016)

When a photon interact with an electron which of the following characteristics of photon can increase?

When plantinum wire is heated, it changes to cherry red at temperature (Swl 2016)

Earth's orbital speed is: (Mtn 2015 Group II)

The value of ℏ in Heisenberg uncertainty Principle is (Sgd 2015 Group I)

Rest mass of photon is (LHR 2016 Group II)

An electron and proton are accelerated throught the same potential. If their masses are m_e and m_p respectively, then the ratio of their de-broglie wavelength is

The value of Wien's constant is: (LHR 2015 Group II)

Minimum energy required for pair production is (Sgd 2015 Group I)

A photon behaves as if it had a mass equal to

compton shift in wave length (&inc; λ) is zero, when scattered angle of photon is (BWP 2016)

The value of Plank's Constant h is: (Mtn 2015 Group II)

In order to observe the position of an electron with more accuracy, one must use light of

Which type of electron wavelength is used in electron microscope?

If E is energy of photon and P is momentum of photon, then velocity of light is equal to

Energy of black body radiation depends upon (RWP 2016)

Mass of photons is equal to (SGD 2016 GROUP I)

The rest mass energy of an electron positron pair is: (LHR 2015 Group I)

For an electron, the rest mass energy is: (Mtn 2015 Group I)

Which one of the following particles can show diffraction effect?

Inertial frame is a frame in which (D.G. Khan 2015 Group I)

Which of the following is the value of plank's constant is (evs)

A photon of wavelength λ can be associated to have a mass equal to

The process of photoelectric effect depends on

In order to reduce uncertainty in momentum, one must use light of

The work function of tungsten and sodium are 5.06ev and 2.53ev respectively. If threshold wavelength of sodium is 5896A^°ree; then threshold wavelength of tungsten will be

Antiparticle of electron is: (Swl 2015)

Plantinum wire at 1300^°ree;C becomes (Sgd 2015 Group II)

Two photons approach each other, their relative speed will be (MTN 2016 GROUP I)

When Plantinum is heated, it becomes orange at: (Mtn 2015 Group I)

The unit of Plank's constant is

The rest mass of X-Ray photon is: (Mirpur 2016)

An electron is placed in a uniform electric field. A the electron moves, its de-Broglie wavelength

According to Stefan's law about black body radiations is (D.G. khan 2016 Group II)

Energy of each positron is given by: (GRW 2015)

Which of the following is the compton shift at an angle 90^°ree;?

According to Heisenberg's second uncertainty principle, the product of energy of a particle and the time at which it has the energy is approximately equal to

_______ has the largest de Broglie wavelength at same speed (MTN 2016 GROUP I)

A proton, accelerated through a P.D of V has a certain de-Broglie wavelength λ In order to have the same de-Broglie, an α - particle must be accelerated through a potential difference

According to De-Broglie, an electron can be regarded as

if h is plank's constant and c is speed of photon then which of the following is the wavelength of photon of energy E?

The screen used in electron microscope is made of _________ material

The quantity h/m_°ree;c has the dimensions of

With the help of 50 kV electron microscope, a resolution of _______ is possible

If measurement show a precise position for an electron, then uncertainty in the measurement of momentum of electron will be

Einstein was awarded Nobel Prize in Physics in: (LHR 2015 Group II)

The value of threshold wavelength for photoelectric effect is 7000A^°ree;. Which of the following radiation will not produce photoelectric effect?

The minimum energy required by photon to create an electron-positron pair is (D.G. Khan 2015 Group II)

The de-Broglie wavelength of a particle of mass m moving with kinetic energy E is

According to Heisenberg's first uncertainty principle, the product of momentum and position of a particle is approximately equal to

Electron microsocope makes practical use of the

Which is the most refined form of matter? (D.G. Khan 2015 Group I)

Davisson and Germer calculated the wavelength of scattered electron from the relation

A light of waelength 5000 A^°ree; is incident on a metal surface whose work function is 2ev. Which of the following will be the maximum K.E of photoelectron?

Dimensions of plank's constant are same as that of

Interference and diffraction confirms

The existence of positron was discovered in the

de-Broglie waves are associated with

The special theory of relativity based on (D.G. khan 2016 Group II)

Wave nature of light appears in (Mirpur 2015)

Louis de-Broglie wavelength of a particle can be expressed by

A positron is a particle having: (Mirpur 2016)

Which of the following is the value of maximum compton shift?

Which light emits greater number of electron from a metal surface?

Compton's effect is associated with: (FSD 2015)

Position and momentum of an electron cannot be measured simultaneously with perfect accuracy, this is

de Broglie got Nobel Prize for their work on

The photn with energy greater than 1.02 MeV can interact with matter as (MTN 2016 GROUP II)

The momentum of the moving photon is (LHR 2016 Group I)

Wave nature of light appears in

An electron, accelerated by P.D V has de-Broglie wavelength λ which of the following will be the de-Broglie wavelength of electron if electron is accelerated by P.D 4V?

An object of large mass and ordinary speed has

Of the following, the one which has the largest de-Broglie wavelength for the same speed is

The momentum of photon is given by the equation: (GRW 2015)

If the energy of incident photon is E ev and work function of metal is ϕ ev then which of the following is the maximum velocity of ejected photoelectron

Rest mass of photon is (Swl 2016)

In order to increase the K.E. of ejected photo electrons, there should be an increase in: (Bwp 2015)

Light from a source is incident on two photocells of work function 3ev and 1.5ev respectively. The energy of incident light is 4.5ev. Which of the following is the ratio of the velocities of photoelectron ejected from two photocells.

The value of Stefen's constant is (FSD 2016)

In compton effect the photon behaves as a: (RWP 2015)

Moving with same velocity, which of following has large wavelength of the metter waves?

All motions are n (LHR 2016 Group I)

Compton effect shows that

The value of h-bar(ℏ) is

if n_r and n_v are number of photons emitted by a red bulb and a violet bulb respectively of equal power in a given time then

the change in wavelength of scattered photon in comton effect is (FSD 2016)

if h is plank's constant, The momentum of a photon of wavelength 0.01A^°ree;

The value of Plank's constant h is given by: (FSD 2015)

A three dimensional image of remarkable quality can be achieved by modern version called

Compton effect proves (SGD 2016 GROUP I)

Potasium cathode in photocell emit electrons for a light: (LHR 2016 Group I)

A positron is an antiparticle of (Mirpur 2015)

Which of the following achieve conversion of electromagnetic energy in to electrical energy

Neglecting variation of mass with velocity, The wavelenght associated with an electron having kinetic energy E is proportional to

The value of Stefan's constant 'σ' is given by (Mirpur 2015)

The plantinum wire becomes white at a temperature of (GRW 2016)

Disintegration of photon on Striking a nucleus into an electron and positron is known as (SGD 2016 GROUP II)

If electron, proton and neutron have same velocity, which of them has the longest wavelength?

Electron and proton have same speed, which one has shorter wavelength associated with them?

It is now believed that light has

According to _____________ electron can never be found in side the nucleus

In Davisson and Germer experiment, target crystal was made up of

Compton shift &inc; λ will be equal to Compton wave length at an angle of (Sgd 2015 Group II)

Light of frequecy 1.5 times the threshold frequency is incident on a photosensitive material. If the frequency is halved and intensity is doubled, the photoelectric current becomes

Compton shift is maximum at an angle

When stopping potential is applied to the anode of the photocell, no current is observed. This means

When plantinum wire is heated, it changes to cherry red at temperature (D.G. Khan 2016 Group I)

Davisson and Germer got Nobel Prize for their work on

The rest mass of photon is: (Swl 2015)

When X-rays are scattered by electrons their wavelength increases. This phenomenon is called

The work function of a metal is Xev when light of energy 2X is made incident on it maximum K.E. of emitted photoelectron will be

The minimum energy required by a photon to create a electron-positron pair is (D.G. khan 2016 Group I)

The form of uncertainty principle which relates the energy of a particle and the time at which it had the energy is given by

If the frequency of incident light in a photoelectric experiment is doubled then