Physics Of Sound Post-test Johnson

When a rubber band is plucked, it creates a rapid back and forth movement. This movement is known as vibration. The sound produced by the vibrating rubber band is what we hear. Loudness refers to the volume or intensity of sound, amplitude is the measure of the maximum displacement of a vibrating object, and pitch is the perceived frequency of a sound.

The correct answer is decibel. Decibel is a unit used to measure the loudness of sounds. It is a logarithmic scale that quantifies the intensity or power of a sound wave. The decibel scale is commonly used in fields such as acoustics and audio engineering to compare and evaluate the relative loudness of different sounds. Vibration, frequency, and pitch are related to sound but do not specifically measure loudness.

A jet plane would produce the loudest sound among the given options. Jet planes are known for their powerful engines and high speeds, which generate a significant amount of noise. The sound produced by a jet plane can reach extremely high decibel levels, especially during takeoff and landing. In comparison, a pin falling, doorbell, and whisper would not produce as loud of a sound as a jet plane.

A sound receiver is a device or mechanism that is designed to detect and receive sound. It can refer to various devices such as microphones, speakers, or even the human ear. These receivers are capable of capturing sound waves and converting them into electrical signals or vibrations that can be perceived or reproduced as sound. Therefore, a sound receiver is the most appropriate option among the given choices to describe something that detects sound.

Echolocation is a process used to locate distant or invisible objects by emitting sound waves and then listening for their reflection. This technique is commonly used by animals such as bats and dolphins to navigate and find prey. The sender, in this case, is the source of the sound waves, while the receiver refers to the animal or device that detects the reflected waves. Echolocation relies on the principle of vibration, as the sound waves create vibrations that bounce off objects and return to the sender, allowing them to determine the location and characteristics of the objects.

Pitch refers to the highness or lowness of a sound. It is determined by the frequency of the sound waves, where higher frequencies result in higher pitch and lower frequencies result in lower pitch. Pitch is a perceptual attribute of sound and is related to the frequency of the sound wave.

When you tighten a string, you increase its tension. This increased tension causes the string to vibrate at a higher frequency, resulting in a higher pitch. Therefore, as you tighten the string and pluck it, the pitch will get higher.

The whistle would produce the highest pitch because it is designed to create a high-frequency sound. The other options, such as the phone, truck horn, and dog's growl, typically produce lower-pitched sounds.

When an object vibrates faster, it means that it is producing more vibrations per second. This results in a higher frequency of sound waves being produced. Pitch is determined by the frequency of sound waves, so when object A is vibrating faster than object B, it will have a higher pitch than object B.

Sound discrimination refers to the ability to differentiate between different sounds. It involves the process of perceiving and recognizing the unique characteristics of each sound, such as pitch, tone, and rhythm. This cognitive skill allows individuals to distinguish and identify various sounds in their environment, including speech sounds, musical notes, and environmental noises. Sound discrimination is essential for language development, communication, and auditory processing. It helps individuals to understand and interpret the world around them through the auditory sense.

When a large sheet of paper is rolled into a funnel shape, it creates a structure that can collect and focus sound waves. This funnel shape helps to direct and concentrate the sound waves towards a specific point, making the sound louder and more audible. This process of increasing the loudness of a sound by directing and concentrating the sound waves is called amplification.

Frequency is the correct answer because it refers to the speed at which something vibrates. It specifically measures the number of vibrations or cycles that occur in a given time period. Pitch refers to the perceived frequency of a sound, amplitude refers to the magnitude or strength of a vibration, and resonance refers to the natural frequency at which an object vibrates.

A sound source refers to an object or material that vibrates in a way that produces sound. It is responsible for creating the sound waves that travel through a medium, such as air or water, and can be perceived by a receiver, such as our ears. The sound source is the origin of the sound and is essential for the production of any audible sound.

Sound travels faster and more efficiently through solid objects compared to liquids and gases. When sound waves travel through solid objects, the particles in the object are closer together, allowing for more efficient transmission of the sound waves. This results in the sound appearing louder when it travels through solid objects.

The correct answer is "the volume". The loudness of a sound refers to the volume of the sound. Volume is a measure of the intensity or strength of a sound wave, indicating how loud or soft a sound is perceived by the human ear. It is determined by the amplitude of the sound wave, with higher amplitudes corresponding to louder sounds and lower amplitudes corresponding to softer sounds. Therefore, the term "volume" accurately describes the loudness of a sound.