Which type of wave can travel through a vacuum?
A. mechanical
B. seismic
C. sound
D. light
9 answers
D. light
Are you sure that's the answer?
Yes, I am sure. Light is an example of an electromagnetic wave, which can travel through a vacuum because it does not require a medium to propagate.
AM waves have a wavelength of approximately 100 meters. FM waves have a wavelength of approximately 1 meter. Which one has a higher frequency? Which one has higher energy?
A. AM has a higher frequency and higher energy.
B. FM has a higher frequency, but AM is higher energy.
C. FM has a higher frequency and higher energy.
D. AM has a higher frequency, but FM is higher energy.
A. AM has a higher frequency and higher energy.
B. FM has a higher frequency, but AM is higher energy.
C. FM has a higher frequency and higher energy.
D. AM has a higher frequency, but FM is higher energy.
The frequency of a wave is inversely proportional to its wavelength, so a shorter wavelength corresponds to a higher frequency. Therefore, FM waves, with a wavelength of approximately 1 meter, have a higher frequency than AM waves, with a wavelength of approximately 100 meters.
The energy of a wave is directly proportional to its frequency, so in this case, FM waves have higher energy compared to AM waves.
Therefore, the correct answer is:
C. FM has a higher frequency and higher energy.
The energy of a wave is directly proportional to its frequency, so in this case, FM waves have higher energy compared to AM waves.
Therefore, the correct answer is:
C. FM has a higher frequency and higher energy.
Why would a person feel cooler wearing a white shirt rather than a black shirt on a sunny day?
A. Light would be mostly transmitted rather than absorbed or reflected.
B. Light would be mostly absorbed or transmitted rather than reflected.
C. Light would be mostly absorbed or reflected rather than transmitted.
D. Light would be mostly reflected rather than absorbed or transmitted.
A. Light would be mostly transmitted rather than absorbed or reflected.
B. Light would be mostly absorbed or transmitted rather than reflected.
C. Light would be mostly absorbed or reflected rather than transmitted.
D. Light would be mostly reflected rather than absorbed or transmitted.
D. Light would be mostly reflected rather than absorbed or transmitted.
A white shirt reflects most of the sunlight falling on it, while a black shirt absorbs most of the sunlight. The absorbed light energy is converted into heat, causing the black shirt to become hotter than the white shirt. Therefore, a person wearing a white shirt would feel cooler than when wearing a black shirt in direct sunlight.
A white shirt reflects most of the sunlight falling on it, while a black shirt absorbs most of the sunlight. The absorbed light energy is converted into heat, causing the black shirt to become hotter than the white shirt. Therefore, a person wearing a white shirt would feel cooler than when wearing a black shirt in direct sunlight.
The formula vw=f ⋅ λ describes the relationship between the speed of a wave (v^w), and its frequency (f) and wavelength (λ).
For example, if a wave has a frequency of 120 Hz and a wavelength of 5m, it would have a speed of 600 m/s.
In one or two sentences, describe what would happen to the frequency of this wave if the wavelength is increased to 10m but the speed stays the same at 600 m/s.
For example, if a wave has a frequency of 120 Hz and a wavelength of 5m, it would have a speed of 600 m/s.
In one or two sentences, describe what would happen to the frequency of this wave if the wavelength is increased to 10m but the speed stays the same at 600 m/s.
If the wavelength of the wave is increased to 10m while the speed stays the same at 600 m/s, the frequency of the wave would decrease. This is because frequency and wavelength are inversely proportional, and increasing the wavelength would result in a lower frequency.