Sound is a form of:

Sound is a mechanical wave that requires a medium to travel through, making it a form of mechanical energy.

Audible frequencies range that a normal human ear can detect is:

The normal human ear can detect frequencies ranging from 20 Hz to 20 kHz.

The approximate value of the speed of sound in air at 0°C temperature is:

The speed of sound in air at 0°C is approximately 332 meters per second.

Sound travels faster in solid as compared to gases because of:

Sound travels faster in solids because the molecules are more tightly packed, allowing sound waves to propagate more quickly.

The two factors that affect the speed of sound in the air are:

The speed of sound in air is affected by temperature and humidity.

The separation between two consecutive compressions of the sound wave is called:

The separation between two consecutive compressions of a sound wave is known as the wavelength.

The order of speed of the sound in different mediums from faster to slowest is:

Sound travels fastest in solids, followed by liquids, and slowest in gases.

Ultrasound has several uses in medicine and industry. Which one has the use of ultrasound?

Ultrasound is commonly used in pre-natal scanning to monitor the development of a fetus.

The cause of the echo is:

An echo is caused by the reflection of sound waves off a surface.

Which type of waves cannot travel through a vacuum?

Sound waves require a medium to travel and cannot propagate through a vacuum.

What type of wave is a sound wave?

A sound wave is a longitudinal wave, where the particles of the medium vibrate parallel to the direction of wave propagation.

Through which medium does sound travel the fastest?

Sound travels fastest through solids because the molecules are closely packed, allowing sound waves to travel more quickly.

What is required for sound to travel from one place to another?

Sound requires a material medium, such as air, water, or solids, to travel.

What happens to the speed of sound in air when temperature increases?

As the temperature increases, the speed of sound in air also increases because the molecules move faster.

What is the term for sounds that are unpleasant to our ears?

Noises are sounds that are typically unpleasant or disruptive to our ears.

What is ultrasound?

Ultrasound refers to sound waves with frequencies higher than the upper audible limit of human hearing, which is above 20 kHz.

What is an echo?

An echo is a reflected sound wave that is perceived by the listener after the original sound due to the delay caused by the reflection.

What is the purpose of SONAR?

SONAR (Sound Navigation and Ranging) is used to locate objects underwater, such as submarines, and to measure the depth of the sea.

What do compressions in a sound wave represent?

Compressions in a sound wave represent regions where the air pressure is slightly higher than normal.

How do sound waves move through a medium?

Sound waves move through a medium by creating compressions (high-pressure regions) and rarefactions (low-pressure regions).

What kind of energy is sound?

Sound is a form of mechanical energy that results from the vibration of particles in a medium.

In a sound wave, how does the vibration of particles relate to the direction of the wave?

In a sound wave, particles vibrate parallel to the direction of wave propagation, which is characteristic of longitudinal waves.

What is the basic formula used to calculate the speed of sound?

The basic formula to calculate the speed of sound is \( \text{speed} = \frac{\text{distance}}{\text{time}} \).

Why does sound travel faster in solids than in gases?

Sound travels faster in solids because the molecules are closer together, allowing sound waves to propagate more quickly.

Which of the following materials has the highest speed of sound at 25°C?

Aluminum has one of the highest speeds of sound among common materials at 25°C.

What is the speed of sound in air at room temperature (25°C)?

The speed of sound in air at room temperature (25°C) is approximately 346 meters per second.

What mechanical device is used to measure distances in the speed of sound experiment?

A trundle wheel is used to measure distances in experiments involving the speed of sound.

Which factor directly increases the speed of sound in air?

Increased temperature directly increases the speed of sound in air.

How does humidity affect the speed of sound?

Humidity generally increases the speed of sound in air.

The speed of sound is nearly the same for all frequencies if:

The speed of sound is nearly the same for all frequencies if the medium and physical conditions remain constant.

What is the relationship between speed of sound and temperature in air?

The speed of sound in air is directly proportional to the square root of the temperature (√T).

In the example, a wave of frequency 6 kHz and wavelength 25 cm takes how long to travel 1.5 km?

To find the time taken to travel 1.5 km, we first calculate the speed of sound using the formula \( \text{speed} = \text{frequency} \times \text{wavelength} \). Converting the wavelength to meters: \( 25 \, \text{cm} = 0.25 \, \text{m} \). Thus, \( \text{speed} = 6000 \, \text{Hz} \times 0.25 \, \text{m} = 1500 \, \text{m/s} \). Then, using the formula \( \text{time} = \frac{\text{distance}}{\text{speed}} \), we get \( \text{time} = \frac{1500 \, \text{m}}{1500 \, \text{m/s}} = 1 \, \text{second} \).

What is the correct formula to calculate the speed of sound using frequency and wavelength?

The correct formula to calculate the speed of sound using frequency (f) and wavelength (λ) is \( v = f \times \lambda \).

Which of the following changes would cause sound to travel more slowly?

Decreasing the temperature of the air would cause sound to travel more slowly.

What does pitch depend on?

Pitch depends on the frequency of the sound wave. Higher frequency results in a higher pitch.

Loudness of a sound depends on which of the following?

The loudness of a sound depends on its amplitude. Greater amplitude results in louder sound.

What is the SI unit of sound intensity?

The SI unit of sound intensity is watt per square meter (W/m²).

Which of the following terms defines the power carried by sound waves per unit area?

Sound intensity defines the power carried by sound waves per unit area.

What is the safe noise level recommended in most countries over an 8-hour workday?

The safe noise level recommended in most countries over an 8-hour workday is 85-90 dB.

What does the unit 'decibel (dB)' measure?

The unit 'decibel (dB)' measures the loudness of sound.

A boy claps and hears the echo after 1.6 seconds. What is the distance of the wall? (Speed of sound = 340 m/s)

To find the distance of the wall, we use the formula for distance in an echo: \( \text{distance} = \frac{\text{speed of sound} \times \text{time}}{2} \). Plugging in the values: \( \text{distance} = \frac{340 \, \text{m/s} \times 1.6 \, \text{s}}{2} = 272 \, \text{m} \).

What is the frequency range of sound that an average human ear can hear?

The frequency range of sound that an average human ear can hear is 20 Hz to 20,000 Hz.

What do we call sounds with frequencies above 20,000 Hz?

Sounds with frequencies above 20,000 Hz are called ultrasound.

Which of the following animals can hear the highest frequency sound?

Bats can hear the highest frequency sounds, which are often in the ultrasonic range.

Which of the following is an application of echocardiography?

Echocardiography is used for viewing heart valves and walls to assess heart function.

In medical ultrasound, what device sends and receives the ultrasound waves?

In medical ultrasound, the transducer is the device that sends and receives the ultrasound waves.

What is the use of ultrasonography during pregnancy?

Ultrasonography during pregnancy is used to view the fetus and internal organs to monitor development and health.

Which sound frequency range is called “infrasonic”?

Infrasonic refers to sound frequencies below 20 Hz.

Which technology is used for measuring ocean floor depths using ultrasound?

SONAR (Sound Navigation and Ranging) is the technology used for measuring ocean floor depths using ultrasound.