Question 1:
What is sound?
Explanation: The correct answer is D) A form of mechanical wave. Sound is a mechanical wave that is created by the vibration of matter, such as air molecules, and travels through a medium, such as air, water, or solids. Unlike light and heat, sound requires a medium for its propagation.
Question 2:
What is the frequency of a sound wave?
Explanation: The correct answer is D) The number of vibrations per second. The frequency of a sound wave refers to the number of vibrations or cycles per second and is measured in Hertz (Hz). It determines the pitch of the sound, with higher frequencies corresponding to higher-pitched sounds and lower frequencies corresponding to lower-pitched sounds.
Question 3:
What is the amplitude of a sound wave?
Explanation: The correct answer is C) The loudness or intensity of the sound. The amplitude of a sound wave refers to the maximum displacement of particles in the medium from their equilibrium position as the wave passes through. It determines the loudness or intensity of the sound, with greater amplitudes corresponding to louder sounds.
Question 4:
What is the speed of sound in air at room temperature?
Explanation: The correct answer is C) 300 meters per second. The speed of sound in air at room temperature is approximately 300 meters per second (or about 340 meters per second at sea level under standard conditions). However, the speed of sound can vary depending on factors such as temperature, humidity, and the composition of the medium through which it travels.
Question 5:
What is the phenomenon called when a sound wave encounters an obstacle and changes direction?
Explanation: The correct answer is A) Reflection. When a sound wave encounters an obstacle, such as a wall or a surface, and changes direction, it is called reflection. The wave bounces off the surface and travels back in the opposite direction. Reflection plays a crucial role in various sound phenomena, such as echoes and the acoustics of enclosed spaces.