JAMB and WAEC Physics questions: Elementary modern physics

27 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Elementary modern physics· JAMB

   A beta particle is

   • Aa fast-moving electron
   • Ba helium nucleus
   • Ca photon
   • Da neutron

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2. Question 22· Elementary modern physics· JAMB

   In the photoelectric effect, the maximum kinetic energy of emitted electrons depends on the:

   • Afrequency of light
   • Bintensity of light
   • Cduration of illumination
   • Darea of the metal

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3. Question 23· Elementary modern physics· JAMB

   Isotopes of an element have the same

   • Anumber of neutrons
   • Bmass number but different atomic numbers
   • Catomic number but different mass numbers
   • Dnumber of nucleons

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4. Question 24· Elementary modern physics· WAEC

   The energy released in nuclear reactions comes from

   • Afriction
   • Bchemical bonds
   • Cthe mass defect, according to E = mc²
   • Delectric current

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5. Question 25· Elementary modern physics· JAMB

   When uranium-238 emits an alpha particle, the mass number of the new nucleus is

   • A242
   • B236
   • C238
   • D234

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6. Question 26· Elementary modern physics· WAEC

   A radioactive substance has a half-life of 4 days. The fraction left after 12 days is

   • A1/16
   • B1/4
   • C1/3
   • D1/8

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7. Question 27· Elementary modern physics· WAEC

   Light of photon energy 3.5 eV falls on a metal whose work function is 2.0 eV. Find the maximum kinetic energy of the emitted electrons.

   • A1.75 eV
   • B5.5 eV
   • C1.5 eV
   • D7.0 eV

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   Explanation and discussion