A sound of 7 kHz frequency is well within the normal hearing range of most people.
True.
False. <<
2. Sound is a transverse compression wave.
True.
False.<<
3. The decibel level of a sound can have a negative value.
True.<<
False.
4. The Doppler effect occurs only for compression waves, such as sound.
True.
False. <<
5. If one sound source has an intensity 30 dB above another, it has a power per unit area 1000 times stronger.
True. <<
False.
6. An observer moving toward a source at a velocity v hears the same frequency as if the observer were standing still and the source were moving towards it at the same velocity.
True.<<
False.
7. The loudness of a sound as perceived by the ear depends only on its intensity.
True. <<
False.
8. When the temperature goes up, the fundamental frequency of an organ pipe will also go up.
True. <<
False.
8. When the temperature goes up, the fundamental frequency of an organ pipe will also go up.
Play with this:
http://hyperphysics.phy-astr.gsu.edu/hbase/waves/opecol.html
were the others correct?
When I did it, I saw that 8 was true, is that right?
I put in 0.5 meter length, open both ends
at 20 deg --> 344 Hz
at 40 deg --->356 Hz
so yes, true :)
I agreed with others.
To fact-check the statements:
1. To determine if a sound of 7 kHz frequency is within the normal hearing range of most people, you can refer to various sources such as scientific studies or medical sources that provide information on the average human hearing range. The normal hearing range for most people is typically between 20 Hz and 20 kHz. By comparing the given frequency of 7 kHz to this range, you can determine if the statement is true or false.
2. To determine if sound is a transverse compression wave, you can refer to basic principles of wave mechanics. Sound waves are actually longitudinal waves, meaning they propagate through compressions and rarefactions in the medium (such as air or water) rather than through transverse wave motion. By understanding the nature of sound waves, you can determine if the statement is true or false.
3. To determine if the decibel level of a sound can have a negative value, you can refer to the definition and scale of decibels. Decibels (dB) are a logarithmic unit used to measure the intensity or power level of a sound. In the logarithmic scale, negative values are possible, indicating a lower intensity or power level compared to a reference value. By considering the concept of decibel scale, you can assess if the statement is true or false.
4. To determine if the Doppler effect occurs only for compression waves, such as sound, you can consult scientific literature or resources that explain the Doppler effect. The Doppler effect can actually occur for any type of wave, including both compression and transverse waves, as long as there is relative motion between the source of the wave and the observer. By understanding the fundamental principles of the Doppler effect, you can confirm if the statement is true or false.
5. To determine if a sound source with an intensity 30 dB above another has a power per unit area 1000 times stronger, you can utilize the logarithmic nature of the decibel scale. Each increase of 10 dB represents a tenfold increase in sound intensity or power. By calculating the difference in decibel levels and understanding the relationship between decibels and sound intensity, you can evaluate if the statement is true or false.
6. To determine if an observer moving toward a source at a velocity v hears the same frequency as if the observer were standing still and the source were moving toward it at the same velocity, you can analyze the principles of the Doppler effect. The Doppler effect causes a change in frequency when there is relative motion between the source and the observer. By considering the effects of the observer's motion and the relative velocities involved, you can establish if the statement is true or false.
7. To determine if the loudness of a sound as perceived by the ear depends only on its intensity, you can refer to the factors that affect the perception of loudness. Loudness is actually a subjective perception and can be influenced by factors other than just intensity, such as frequency, duration, and personal hearing abilities. By considering the various factors that contribute to the perception of loudness, you can determine if the statement is true or false.
8. To determine if the fundamental frequency of an organ pipe will go up when the temperature increases, you can analyze the relationship between temperature and the speed of sound in air. The speed of sound in air is dependent on temperature, and this, in turn, affects the fundamental frequency of an organ pipe. By understanding the relationship between temperature and the speed of sound, you can assess if the statement is true or false.