## DUAL NATURE OF RADIATION AND MATTER quiz-20

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1. Ultraviolet light of wavelength 300 nm and intensity 1.0 Wm-2 falls on the surface on photoelectric metal. If one percent of incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly
•  2.13×1011 s-1
•  1.5×1012 s-1
•  3.02×1012 s-1
•  None of these
Solution
Energy of each photon =hc/Î» = (6.6×10-34×3×108)/(300×10-9) = 6.6×10-19 J Power of source is given by p= intensity × area = 1.0×1.0×10-4 W = 10-4 W No. of photons per second = p/e=10-4/(6.6×10-19) Now number of electron emitted = 1/100×(10-4 /6.6×10-19 ) =1.5×1012 s-1

Q2.Which of the following statement about photon is incorrect?
•   Photons exert no pressure
•   Momentum of photon is hv/c
•   Photon’s rest mass is zero
•   Photon’s energy is hv
Solution
Photos move with velocity of light and have energy hv. Therefore, they also exert pressure

Q3. The wavelength of the matter wave is independent of
•  Mass
•  Velocity
•  Momentum
•  Charge
Solution
Charge

Q4. For moving ball of cricket, the correct statement about de-Broglie wavelength is
•  It is not applicable for such big particle
•  h/√2mE
•  √(h/2mE)
•  h/2mE
Solution
h/√2mE

Q5.In above question the energy of the characteristic X-rays given out is
•  Less than 40 keV
•  More than 40 keV
•  Equal to 40 keV
•  ≥40 keV
Solution
Less than 40 keV

Q6. Light of frequency v is incident on a substance of threshold frequency v0 (v0<v). The energy of the emitted photoelectron will be
•  h(v-v0)
•  h/v
•  he(v-v0)
•  h/v0
Solution
h(v-v0)

Q7.Cathode rays are similar to visible light rays as
•  They both can be deflected by electric and magnetic fields
•  They both have a definite magnitude of wavelength
•  They both can ionize a gas through which they pass
•  They both can expose a photographic plate
Solution
Light consists of photons and cathode rays consists of electrons. However both effect the photographic plate

Q8.A photo cell is receiving light from a source placed at a distance of 1 m. If the same source is to be placed at a distance of 2 m, then the ejected electron
•  Moves with one-fourth energy as that of the initial energy
•  Moves with one-fourth of momentum as that of the initial momentum
•  Will be half in number
•  Will be one-fourth in number
Solution
Number of ejected electrons ∝ (Intensity) ∝1/(Distance)2 Therefore an increment of distance two times will reduce the number of ejected electrons to 1/4 th of the initial value

Q9.According to Mosely’s law, the frequency of a spectral line in X-ray spectrum varies as
•  Atomic number of the element
•  Square of the atomic number of the element
•  Square ropot of the atomic number of the element
•  Fourth power of the atomic number of the element
Solution
Square of the atomic number of the element

Q10. Electron with energy 80 keV are incident on the tungsten target of a X-rays tube. Kshell electrons of tungsten have -72.5keV energy. X-rays emitted by the tube contain only
•  A continuous X-rays spectrum (Bremsstrahlung) with a minimum wavelength of ~0.155â„«
•  A continuous X-ray spectrum (Bremsstrahlung) with all wavelengths
•  The characteristic X-rays spectrum of tungsten
• A continuous X-rays spectrum (Bremsstrahlung) with a minimum wavelength of ~0.155 â„« and the characteristic X-rays spectrum of tungsten
Solution
Since the energy of incident electron, E=80 keV. The minimum wavelength of X-rays produced is Î»=hc/E=(6.6×10-34×3×108)/(80×1000×1.6×10-19 ) =1.55×10-10 m=0.155 â„« Since the energy of K-shell electron is -72.5 keV, so the incident electron of energy 80 keV will not only produce continuous spectrum of minimum wavelength 0.155â„« but shell also knock electron of K shell out of atom, resulting emission of characteristics X-rays

## Want to know more

Please fill in the details below:

## Latest NEET Articles\$type=three\$c=3\$author=hide\$comment=hide\$rm=hide\$date=hide\$snippet=hide

Name

Admissions,1,Alternating Current,60,AP EAMCET 2020,1,Basic Maths,2,BCECE 2020,1,best books for iit jee,2,best coaching institute for iit,1,best coaching institute for iit jee preparation,1,best iit jee coaching delhi,1,best iit jee coaching in delhi,2,best study material for iit jee,4,BITSAT Registration 2020,1,Blog,62,books for jee preparation,1,books recommended by iit toppers,3,Capacitance,3,CBSE,1,CBSE accounts exam,1,CBSE boards,1,CBSE NEET,9,cbse neet 2019,3,CBSE NEET 2020,1,cbse neet nic,1,Centre of Mass,2,Chemistry,58,Class 12 Physics,15,coaching for jee advanced,1,coaching institute for iit jee,2,Collision,2,COMEDK UGET 2020 Application Form,1,COMEDK UGET 2020 Exam Form,1,COMEDK UGET news,1,CUCET 2020,2,Current Electricity,4,CVR college,1,Digestion and Absorption Notes PDF,1,Electromagnetic Induction,3,Electronics,1,Electrostatics,3,Energy,1,Engineering & Medical,1,Fluid Mechanics,4,Gravitation,2,GUJCET 2020 Application Form,1,Heat,4,iit admission,1,iit advanced,1,iit coaching centre,3,iit coaching centre in delhi,2,iit coaching classes,2,iit coaching in delhi,1,iit coaching institute in delhi,1,iit entrance exam,1,iit entrance exam syllabus,2,iit exam pattern,2,iit jee,5,iit jee 2019,3,iit jee advanced,2,iit jee books,3,iit jee coaching,2,iit jee exam,3,iit jee exam 2019,1,iit jee exam pattern,3,iit jee institute,1,iit jee main 2019,2,iit jee mains,3,iit jee mains syllabus,2,iit jee material,1,iit jee online test,3,iit jee practice test,3,iit jee preparation,6,iit jee preparation in delhi,2,iit jee preparation time,1,iit jee preparation tips by toppers,2,iit jee question paper,1,iit jee study material,3,iit jee study materials,2,iit jee syllabus,2,iit jee syllabus 2019,2,iit jee test,3,iit preparation,2,iit preparation books,5,iit preparation time table,2,iit preparation tips,2,iit syllabus,2,iit test series,3,IITJEE,100,Important Biology Notes for NEET Preparation,1,IPU CET,1,JEE Advanced,83,jee advanced exam,2,jee advanced exam pattern,1,jee advanced paper,1,JEE Books,1,JEE Coaching Delhi,3,jee exam,3,jee exam 2019,6,JEE Exam Pattern,2,jee exam pattern 2019,1,jee exam preparation,1,JEE Main,85,jee main 2019,4,JEE Main 2020,1,JEE Main 2020 Application Form,2,JEE Main 2020 news,2,JEE Main 2020 Official Answer Key,1,JEE Main 2020 Registration,1,JEE Main 2020 Score,1,JEE Main application form,1,jee main coaching,1,JEE Main eligibility criteria,3,jee main exam,1,jee main exam 2019,3,jee main online question paper,1,jee main online test,3,JEE Main Paper-2 Result,1,jee main registration,2,jee main syllabus,2,JEE mains 2020,1,jee mains question bank,1,jee mains test papers,3,JEE Mock Test,2,jee notes,1,jee past papers,1,JEE Preparation,2,jee preparation in delhi,1,jee preparation material,4,JEE Study Material,1,jee syllabus,6,JEE Syllabus Chemistry,1,JEE Syllabus Maths,1,JEE Syllabus Physics,1,jee test series,3,KCET - 2020,1,Kinematics,1,Latest article,5,Latest Articles,61,Latest News,34,latest news about neet exam,1,Laws of Motion,2,Magnetic Effect of Current,3,Magnetism,3,MHT CET 2020,2,MHT CET 2020 exam schedule,1,Modern Physics,1,NCERT Solutions,15,neet,3,neet 2019,1,neet 2019 eligibility criteria,1,neet 2019 exam date,2,neet 2019 test series,2,NEET 2020,2,NEET 2020 Application Form,1,NEET 2020 Eligibility Criteria,1,NEET 2020 Registration,1,neet application form,1,neet application form 2019 last date,1,Neet Biology Syllabus,1,Neet Books,3,neet eligibility criteria,3,neet exam 2019,7,neet exam application,1,neet exam date,1,neet exam details,1,neet exam pattern,6,neet exam pattern 2019,2,neet examination,1,neet mock test 2019,1,Neet Notes,3,Neet Online Application Form,3,neet online test,2,neet past papers,1,neet physics syllabus,1,neet practice test,2,NEET preparation books,1,neet qualification marks,1,NEET question paper 2019,1,neet question papers,1,neet registration,1,Neet Study Material,3,neet syllabus,6,neet syllabus 2019,5,NEET Syllabus 2020,1,neet syllabus chemistry,1,neet syllabus for biology,1,neet syllabus for physics,1,neet test series,1,neet ug 2019,2,news,5,online study material for iit jee,1,Optical Instruments,1,Physics,110,physics books for iit jee,1,Power,1,Practical Physics,1,Quiz,5,Ray Optics,1,Rotational Motion,3,SHM,3,Simple Harmonic Motion,3,study materials for iit jee,1,Study Notes,110,study notes for iit jee,1,Thermodynamics,4,TS EAMCET Notification,2,Units and Dimensions,1,UPSEE 2020,1,UPSEE 2020 Application Form,2,UPSEE EXAM,1,Vectors,2,VITEE Application form,1,Wave Motion,3,Wave Optics,1,WBJEE 2020 Admit Card,1,WBJEE 2020 Answer Key,1,Work,1,
ltr
item
BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET & IIT JEE COACHING: QUIZ-20 DUAL NATURE OF RADIATION AND MATTER
QUIZ-20 DUAL NATURE OF RADIATION AND MATTER