The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV; find the stopping potential?
A. 2.17V B. 1.49V C. 1.09V D. 0.34V Correct Answer: Option D – 0.34V Explanation The stopping potential is the potential required to stop the most energetic photo-emitted electron. From the relation e Vs = K.E,(max) where e is the electron charge, and Vs is the...
The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is?
A. 90° B. 45° C. 30° D. 0° Correct Answer: Option C – 30° Explanation The force on a moving charge in a magnetic field is given by F = q V β sin θ and this force is maximum when θ = 90o, during which sin 90° = 1: and for sinθ = 0.5, θ =...
A circuit has an area of 0.4m² and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rads−¹ in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is
A. 8V B. 16V C. 20V D. 80V Correct Answer: Option D – 80V Explanation The induced voltage = time rate of change of magnetic flux i/e E = NΔ∅B Δt But ∅B = Magnetic Flux = Magnetic Induction (B) x (A) = 0.4T x 0.4m2 = 0.16 volt second i/e E = NΔ∅B Δt = 0.16 x 10 x...
The count rate of radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later?
A. 200 count / min B. 100 count / min C. 50 count / min D. 25 count / min Correct Answer: Option C – 50 count / min Explanation 116 days = 4 half-lives Thus, after 4 half lives the fraction left of any radioactive materials is given by (1/2)4 = 1/16 ∴ Count rate...Products
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