In photo-emission; the number of photo-electrons ejected per second depends on the?
A. frequency of the beam B. work function of the metal C. threshold frequency of the metal D. intensity of the beam Correct Answer: Option C – threshold frequency of the metal
Calculate the energy of the third level of an atom if the ground state energy is – 24.8eV?
A. -9.20eV B. -8.20eV C. -2.75eV D. -1.75eV Correct Answer: Option C = -2.75eV Explanation E3=E/n² E3=−24.8/3² E3=2.75eV
If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited; what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?
A. 2.4g B. 3.2g C. 4.6g D. 4.8g Correct Answer: Option C – 4.6g Explanation First, let’s find z z = M/It z = 1.8/{2.5×(3×60×60)} Therefore, the new M equals M = zIt M = (1.8×4×4.8×60×60)/(2.5×3×60×60) M =...
Induced emfs are best explained using?
A. Ohm’s law B. Faraday’s law C. Colomb’s law D. Lenz’s law Correct Answer: Option D – Lenz’s lawProducts
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