1. What is true about X-rays and microwaves?
a. X-rays have greater speed than microwaves.
b. X-rays have greater amplitude than microwaves.
c. X-rays have greater frequency than microwaves.
d. X-rays have greater wavelength than microwaves.
2. The wavelength of a longitudinal wave is the distance from,
a. compression to rarefaction.
b. compression to compression.
c. crest to trough.
d. crest to crest.
3. What is one reason sound travels faster in liquid water than in air?
a. Air molecules are less elastic than liquid water molecules because air molecules have weaker attractions.
b. Air molecules are more elastic than liquid water molecules because air molecules have weaker attractions.
c. Air molecules are more elastic than liquid water molecules because air molecules have stronger attractions.
d. Air molecules are less elastic than liquid water molecules because air molecules have stronger attractions.
1. c
2. a
3. d
PLEASE... :) and THANK YOU!
1. The correct answer is c. X-rays have greater frequency than microwaves. X-rays have a higher frequency and shorter wavelength than microwaves.
2. The correct answer is a. The wavelength of a longitudinal wave is the distance from compression to rarefaction. In a longitudinal wave, the particles of the medium move parallel to the direction of wave propagation, creating regions of compression (where the particles are close together) and rarefaction (where the particles are spread apart). The wavelength is the distance between two consecutive compressions or two consecutive rarefactions.
3. The correct answer is d. Air molecules are less elastic than liquid water molecules because air molecules have stronger attractions. Sound travels faster in liquid water than in air due to the higher elasticity of liquid water molecules. The stronger attractions between liquid water molecules make them more resistant to compression and allow sound waves to propagate more quickly through the medium. In contrast, air molecules have weaker attractions and are less elastic, causing sound to travel slower in air compared to liquid water.
I hope this helps! Let me know if you have any other questions.
To find the correct answers to these questions, we need to understand the characteristics of X-rays and microwaves, the terminology associated with longitudinal waves, and the properties of sound propagation in different mediums.
1. X-rays and microwaves are both types of electromagnetic waves. Electromagnetic waves are characterized by their speed, wavelength, frequency, and amplitude.
a. Speed: Electromagnetic waves, including X-rays and microwaves, all travel at the same speed in a vacuum, which is the speed of light.
b. Amplitude: The amplitude of a wave refers to the maximum displacement of particles in the medium. It is unrelated to the type of electromagnetic wave. Therefore, X-rays and microwaves have the same amplitude.
c. Frequency: Frequency refers to the number of waves passing a fixed point in a given time. X-rays have a higher frequency than microwaves. Therefore, the correct answer is c.
d. Wavelength: Wavelength refers to the distance between two consecutive points in a wave with the same phase. X-rays have a shorter wavelength than microwaves. Therefore, the statement "X-rays have greater wavelength than microwaves" is incorrect.
Answer: The correct option is c. X-rays have greater frequency than microwaves.
2. The terminology associated with longitudinal waves is crucial to finding the answer.
a. Compression to rarefaction: A longitudinal wave consists of compressions and rarefactions. A compression is the region of high particle density, while rarefaction is the region of low particle density. The distance from compression to rarefaction is not related to the wavelength.
b. Compression to compression: This option does not specify the type of wave and is not a precise measurement in longitudinal waves.
c. Crest to trough: Crest and trough refer to the high and low points of a transverse wave, not a longitudinal wave.
d. Crest to crest: Similarly, this option relates to the high points of a transverse wave, not a longitudinal wave.
Answer: The correct option is a. The wavelength of a longitudinal wave is the distance from compression to rarefaction.
3. The reason sound travels faster in liquid water than in air relates to the properties of the medium and the behavior of sound waves.
a. Air molecules are less elastic than liquid water molecules because air molecules have weaker attractions: This statement is incorrect. Elasticity and attractions between molecules do not determine the speed of sound.
b. Air molecules are more elastic than liquid water molecules because air molecules have weaker attractions: This statement is incorrect. Elasticity and attractions between molecules do not determine the speed of sound.
c. Air molecules are more elastic than liquid water molecules because air molecules have stronger attractions: This statement is incorrect since it confuses the concepts of elasticity and attractions.
d. Air molecules are less elastic than liquid water molecules because air molecules have stronger attractions: Sound travels faster in a medium with higher elasticity. In compressible mediums like air, the elasticity of the medium is low, hence sound travels slower. Incompressible mediums like liquid water have higher elasticity, allowing sound to propagate faster.
Answer: The correct option is d. Air molecules are less elastic than liquid water molecules because air molecules have stronger attractions, which leads to a slower speed for sound compared to liquid water.
Therefore, the correct answers are:
1. c
2. a
3. d