Which of the following is true of frequency and volume?
A) The frequency is not affected as the volume of sound increases.
B) The frequency increases as the volume of sound increases.
C) The frequency decreases as the volume of sound increases.
D) The frequency speeds up as the volume of sounds increases.'
Many devices use the electromagnetic spectrum including radios, cell phones, and medical equipment. When designing a device using the electromagnetic spectrum, which type of waves will provide the device with the most energy?
A) waves that have shorter wavelengths and higher frequencies
B) waves that have longer wavelengths and lower frequencies
C) waves that have shorter wavelengths and lower frequencies
D) waves that have longer wavelengths and higher frequencies
When the pitch of a wave increases, the wavelength of the wave:
A) doubles
B) increases
C) decreases
D) stays the same
Isabela creates a demonstration showing a sound echo. How could she demonstrate this?
A) She throws a rubber ball at a wall, and it bounces back to her.
B) She throws water at a wall, and it drips down the wall.
C) She throws an egg at a wall, and it breaks and falls to the floor.
D) She throws sand at a wall, and it hits the wall and falls to the floor.
Which of the following is NOT a type of radiation from the Sun?
A) ultraviolet waves
B) radio waves
C) x-ray waves
D) television waves
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The correct answers are:
1) C) The frequency decreases as the volume of sound increases.
2) A) Waves that have shorter wavelengths and higher frequencies will provide the device with the most energy.
3) C) The wavelength of the wave decreases when the pitch of a wave increases.
4) A) She throws a rubber ball at a wall, and it bounces back to her to demonstrate a sound echo.
5) D) Television waves is NOT a type of radiation from the Sun.
1) The correct answer to the first question is C) The frequency decreases as the volume of sound increases. To understand this, you can think about the relationship between frequency and volume in sound waves. Frequency refers to the number of cycles of a sound wave that occur in one second, and it is measured in Hertz (Hz). Volume, on the other hand, refers to the perceived loudness or softness of a sound, and it is measured in decibels (dB). As the volume of a sound increases, it means that the amplitude of the sound wave (the height of its peaks and troughs) increases. However, the frequency of the sound wave remains the same. So, as the volume increases, the frequency does not change.
2) The correct answer to the second question is A) waves that have shorter wavelengths and higher frequencies. When designing a device that uses the electromagnetic spectrum, waves that have shorter wavelengths and higher frequencies will provide the device with the most energy. This is because the energy carried by an electromagnetic wave is directly proportional to its frequency. So, waves with higher frequencies (shorter wavelengths) will have more energy compared to waves with lower frequencies (longer wavelengths).
3) The correct answer to the third question is C) decreases. When the pitch of a wave increases, it means that the frequency of the wave is increasing. Pitch refers to the perceived highness or lowness of a sound, and it is directly related to the frequency of the sound wave. As the frequency of a wave increases, the wavelength of the wave decreases. This means that the distance between successive peaks or troughs of the wave becomes shorter, resulting in a higher pitch.
4) The correct answer to the fourth question is A) She throws a rubber ball at a wall, and it bounces back to her. An echo occurs when a sound wave reflects off a surface and returns to the listener. In this scenario, throwing a rubber ball at a wall and hearing it bounce back is a demonstration of an echo. The sound wave produced by the ball hitting the wall reflects off the surface and travels back to the listener, creating the perception of an echo.
5) The correct answer to the fifth question is D) television waves. Television waves are not a type of radiation from the Sun. The Sun emits various forms of electromagnetic radiation, including ultraviolet waves, radio waves, and x-ray waves. However, television waves are not naturally emitted by the Sun. Television waves, also known as radio waves, are used for broadcasting television signals and are generated by human-made devices rather than being directly emitted by the Sun.