Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
The particle nature of light is demonstrated by the
photoelectric effect
speed of light
colours of light
diffraction of light
Correct answer is A
No explanation has been provided for this answer.
In photo-emission, the number of photo-electrons ejected per second depends on the?
frequency of the beam
work function of the metal
threshold frequency of the metal
intensity of the beam
Correct answer is D
The photoelectric effect is dependent upon various factors including frequency of light, intensity of light, nature of material, energy of light and potential difference.
Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV
-9.20eV
-8.20eV
-2.75eV
-1.75eV
Correct answer is C
\(E_3 = \frac{E}{n^2}\)
\(E_3 = \frac{-24.8}{3^2}\)
\(E_3 = 2.75eV\)
2.4g
3.2g
4.6g
4.8g
Correct answer is C
First let's find z
z = \(\frac{M}{It}\)
z = \(\frac{1.8}{2.5 \times (3 \times 60 \times 60)}\)
Therefore, the new M equals
M = zIt
M = \(\frac{1.8 \times 4 \times 4.8 \times 60 \times 60}{2.5 \times 3 \times 60 \times 60}\)
M = 4.6g
Induced emfs are best explained using
Ohm's law
Faraday's law
Colomb's law
Lenz's law
Correct answer is B
No explanation has been provided for this answer.