Question 1 :
Which of the following metal thermionically emits an electron at a relatively lowest temperature among them
Question 2 :
When green light is incident on the surface of metal, it emits photo-electrons but there is no such emission with yellow colour light. Which one of the colours can produce emission of photo-electrons
Question 3 : On increasing the number of electrons striking the anode of an <img style='object-fit:contain' width='10' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28cbe8ab67a08eba5518a"> -ray tube, which one of the following parameters of the resulting <img style='object-fit:contain' width='10' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28cbe8ab67a08eba5518a"> -rays would increase?
Question 4 : Intensity of <img style='object-fit:contain' width='10' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28cbe8ab67a08eba5518a"> -rays depends upon the number of
Question 5 :
In the phenomenon of electron discharge through gases at low pressure, the coloured glow in the tube appears as a result of
Question 7 : The work function of aluminium is <img style='object-fit:contain' width='42' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28e3e3c680714de9a8cc9"> If two photons, each of energy <img style='object-fit:contain' width='39' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28cf68ab67a08eba551e5"> strike an electron of aluminium, then emission of electrons will be
Question 8 :
If the kinetic energy of a free electron doubles, it's deBroglie wavelength changes by the factor
Question 11 :
Which of the following when falls on a metal will emit photoelectrons?
Question 12 :
The specific charge for positive rays is much less than that for cathode rays. This is because
Question 16 :
The maximum velocity of an electron emitted by light of wavelength {tex} \lambda {/tex} incident on the surface of a metal of work- function {tex} \phi {/tex} is
Question 18 :
When a high energy UV photon beam enters an electric field, it will be
Question 19 :
In the Davission and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
Question 21 :
In photoelectric effect, the number of electrons ejected per second is
Question 22 :
The cathode of a photoelectric cell is changed such that the work function changes from {tex} \mathrm { W } _ { 1 } {/tex} to {tex} \mathrm { W } _ { 2 } \left( \mathrm { W } _ { 2 } > \mathrm { W } _ { 1 } \right) {/tex} . If the current before and after changes are {tex} \mathrm { I } _ { 1 } {/tex} and {tex} \mathrm { I } _ { 2 } , {/tex} all other conditions remaining unchanged, then (assuming hv > {tex}{ W } _ { 2 }{/tex} )
Question 23 : For the production of <img style='object-fit:contain' width='10' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28cbe8ab67a08eba5518a"> -rays, the target should be made of
Question 24 :
When an inert gas is filled in place of vacuum in a photo cell, then
Question 26 :
Which of the following event, support the quantum nature of light?
Question 27 :
The momentum of a charged particle moving in a perpendicular magnetic field depends on
Question 30 :
Which of the following law is used in the Millikans method for the determination of charge
Question 31 : <img style='object-fit:contain' width='27' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28d098ab67a08eba55247"> ratio of anode rays produced in a discharge tube, depends on the
Question 32 : According to de-Broglie, the de-Broglie wavelength for electron in an orbit of (radius <img style='object-fit:contain' width='86' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28d943c680714de9a8a96"> ) hydrogen atom is <img style='object-fit:contain' width='53' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28d953c680714de9a8a97"> The principle quantum number for this electron is
Question 33 : The threshold wavelength for photoelectric emission from a material is <img style='object-fit:contain' width='45' height='21' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28e188ab67a08eba55523"> . Photoelectrons will be emitted from the material, when it is illuminated with light from a
Question 34 :
Which of the following cannot be explained on the basis of photoelectric theory?
Question 35 :
Cathode rays enter a magnetic field making oblique angle with the lines of magnetic induction. What will be the nature of the path followed?
Question 36 : Sodium and copper have work functions <img style='object-fit:contain' width='39' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28cee8ab67a08eba551b6"> and <img style='object-fit:contain' width='39' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28de53c680714de9a8b90"> respectively. Then the ratio of their threshold wavelengths is nearest to
Question 37 :
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
Question 38 :
In a discharge tube ionization of enclosed gas is produced due to collisions between
Question 40 :
Which phenomenon best supports the theory that matter has a wave nature
Question 41 :
The variation of photoelectric current given by the photocell, with the intensity of light, is give by a graph, which is a straight line with
Question 43 :
The ratio of the respective de Broglie wavelengths associated with electrons accelerated from rest with the voltages {tex} 100 \mathrm { V } , 200 \mathrm { V } {/tex} and 300{tex} \mathrm { V } {/tex} is
Question 44 : The ratio of specific charge of an <img style='object-fit:contain' width='9' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28cbc8ab67a08eba55181"> -particle to that of a proton is
Question 45 :
The continuous X-rays spectrum produced by an X-ray machine at constant voltage has
Question 46 :
A photon, an electron and a uranium nucleus all have the same wavelength. The one with the most energy
Question 48 :
The colour of the positive column in a gas discharge tube depends on
Question 49 :
In the photoelectric effect the velocity of ejected electrons depends upon the nature of the target and
Question 50 : If an electron oscillates at a frequency of <img style='object-fit:contain' width='39' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea28e6c8ab67a08eba55624"> it gives
