Introduction to Physics

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21. The branch of physics that deals with the behavior of light is called:
a) Thermodynamics
b) Optics
c) Acoustics
d) Electromagnetism

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22. The speed of light in a vacuum is approximately:
a) 300,000 m/s
b) 3 x 10⁸ m/s
c) 9.8 m/s²
d) 10 m/s

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23. The phenomenon in which a wave encounters an obstacle and bends around it is called:
a) Refraction
b) Reflection
c) Diffraction
d) Dispersion

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24. The process of converting a gas into a liquid by cooling is called:
a) Evaporation
b) Sublimation
c) Condensation
d) Melting

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25. Which law states that the pressure of a gas is inversely proportional to its volume at constant temperature?
a) Boyle’s law
b) Archimedes’ principle
c) Pascal’s law
d) Newton’s law of cooling

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