Category: A-level modern physics
What are X-rays?
What are X-rays? X- rays are electromagnetic radiations of very high frequency (short wavelength) produced when cathode rays strike metal target. Please Subscribe to promote ... Read More
Mention health hazards of radioisotopes
Mention health hazards of radioisotopes Cause genetic mutation Cause cancer Cause deep seated wounds in humans Please Subscribe to promote this website. Subscription is ... Read More
Sketch a graph showing the variation of binding energy per nucleon with mass number, clearly showing the fusion and fissions and use the sketch to explain how energy is released in each of the process of fusion and fission.
Sketch a graph showing the variation of binding energy per nucleon with mass number, clearly showing the fusion and fissions and use the sketch to ... Read More
State and explain the conditions for a heavy nucleus to be unstable
State and explain the conditions for a heavy nucleus to be unstable A heavy nucleus is unstable if there are too many neutrons or too ... Read More
What are isotopes isotopes?
What are isotopes isotopes? Isotopes are atoms of the same atomic number but difference atomic mass Please Subscribe to promote this website. Subscription is free ... Read More
What is meant by radioactivity ?
What is meant by radioactivity ? Radioactivity is the spontaneous disintegration of radioactive nuclide or atoms accompanied by emission of radiation Please Subscribe to promote ... Read More
Explain the application of carbon-14 in carbon dating.
Explain the application of carbon-14 in carbon dating. Carbon-14 isotope is radioactive with half-life t½ = 5600years It is absorbed and maintained at constant concentration ... Read More
State differences between alpha and beta particles
State differences between alpha and beta particles Alpha particle Beta particles Positively charged Negatively charged Low penetrating power High penetrating power High ionizing power Low ... Read More
What is the main distinction between work function and ionization energy?
What is the main distinction between work function and ionization energy? Ionization energy is the minimum energy required to remove its most loosely bound electron ... Read More
What is the difference between soft and hard X-rays
What is the difference between soft and hard X-rays Hard X-rays have higher penetrating power than soft X-rays Hard X-rays have shorter wavelength than soft ... Read More
Describe using a labelled diagram, the mode of operation of an X-ray tube
Describe using a labelled diagram, the mode of operation of an X-ray tube Mode of operation The filament is heated by a low voltage supply ... Read More
State differences between X-rays and cathode rays.
State differences between X-rays and cathode rays. X-rays Cathode rays Electrical magnetic wave of very short wavelength Streams of fast moving electrons Have no ... Read More
With the aid of a diagram, describe the operation of Bainbridge mass spectrometer in the determination of charge to mass ratio.
With the aid of a diagram, describe the operation of Bainbridge mass spectrometer in the determination of charge to mass ratio. T1 and T2 are ... Read More
Explain what is observed in a discharge tube when the pressure is gradually reduced to low values?
Explain what is observed in a discharge tube when the pressure is gradually reduced to low values? Please Subscribe to promote this website. Subscription ... Read More
Explain how energy is released in a nuclear fusion process.
Explain how energy is released in a nuclear fusion process. When two small nuclei combine, the total mass of the two nuclei is greater than ... Read More
What is binding energy?
What is binding energy? Binding energy is the energy required to split the nucleus into protons and neutrons. Please Subscribe to promote this website. ... Read More
Explain uses of radioactive isotopes
Explain uses of radioactive isotopes. Carbon dating: activity of fresh and dad material samples are obtained and the age of the dead material obtained. Treatment ... Read More
Explain uses of radioactive isotopes.
Explain uses of radioactive isotopes. Carbon dating: activity of fresh and dad material samples are obtained and the age of the dead material obtained. Treatment ... Read More
What is meant by unified atomic unit?
What is meant by unified atomic unit? Please Subscribe to promote this website. Subscription is free Share with a friend Your comment is valuable Thank ... Read More
What an electron volt?
What an electron volt? Electron volt is the kinetic energy gained by electron which has been accelerated through a p.d of 1volt. Please Subscribe to ... Read More
With the aid of a labelled diagram, describe the action of an ionization chamber.
With the aid of a labelled diagram, describe the action of an ionization chamber. A radiation source on the brass flat form causes ionization of ... Read More
What is half-life of a radioactive material?
What is half-life of a radioactive material? Half-life is the time taken by the number of atoms to decay to half original value. Share ... Read More
What is Activity as applied to radioactivity?
What is Activity as applied to radioactivity? Activity is the number of atoms disintegrating per second Please Subscribe to promote this website. Subscription is free ... Read More
what is meant by excitation potential of an atom?
what is meant by excitation potential of an atom? Excitation potential of an atom is the potential required to raise atom from ground state to ... Read More
Draw a labelled diagram to show the main parts of a cathode ray oscilloscope (C.R.O)
Draw a labelled diagram to show the main parts of a cathode ray oscilloscope (C.R.O) Please Subscribe to promote this website. Subscription is free ... Read More
Describe how full-wave rectification of a.c can be achieved using four semiconductor diodes.
Describe how full-wave rectification of a.c can be achieved using four semiconductor diodes. When X is positive relative to Y, diodes B and D conduct ... Read More
With the aid of a diagram, describe Millikan’s experiment to determine the charge on an oil drop
With the aid of a diagram, describe Millikan’s experiment to determine the charge on an oil drop Separation between the plates P1 and P2 is ... Read More
State properties of cathode rays
State properties of cathode rays They are negatively charged Travel in straight lines Travel with the same speed Affect photographic plates Please Subscribe to promote ... Read More
What are cathode rays?
What are cathode rays? Cathode rays are streams of fast moving electrons Please Subscribe to promote this website. Subscription is free Share with a friend ... Read More
Modern physic A-level notes
Modern Physics (A-level) Photoelectric effect In metals, atoms exists as positive ions in a sea of electrons. An electron near the surface of the metal, ... Read More
Modern physic (A-level paper 1 section C) Revision questions and answers
(a) (i) What are cathode rays? (01marks) Cathode rays are streams of fast moving electrons (ii) State two properties of cathode rays (01mark) They are ... Read More
Deflection of an electron in a magnetic field
Deflection of an electron in a magnetic field Consider an electron entering a uniform magnetic field of flux B, at right angles to its direction ... Read More
Experimental evidence for quantum theory
Experimental evidence for quantum theory Photoelectric effect: To liberate an electron from a metal surface, a quantum or packet of energy called the work function ... Read More
Photocells
The Photocells Photocells change radiation into electric current. In their construction, the anode is made thin so that it does not obstruct the incident radiation ... Read More
Photoelectric emission effect
Photoelectric emission effect In metals, atoms exists as positive ions in a sea of electrons. An electron near the surface of the metal, say A, ... Read More