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What is the sound source when beating the drum
Yesterday, I argued with my daughter about a physics problem in grade two of junior high school: beating the drum with a drum stick, is the sound source a drum or a drum stick? According to the physics book, the correct two are both, but if the sound size is different, it is indeed a drum! The moment the drum stick hits the drum,
Loudness is determined by the sound source_________ The decision is also related to_____ And______ About throwing some paper pieces on the drum surface, tap and knock again. Heavy knocking is a loud indication When the stethoscope diagnoses the disease, the sound is through_____ The heard heartbeat sound is particularly clear because the transmission range of the sound is small_____ more
Amplitude distance sound source type
Solid loudness
Beat the drum with a drumstick to make a sound. The sound source of the drum is a drumstick B drum surface C air D drum side What the hell is it
The drum surface sound source is something that pushes the air
When people beat the drum, they can make a pleasant drum sound, which shows what makes the sound When people beat the drum, they can make a pleasant drum sound, which shows what makes the sound
bo
Why does sound travel in the form of waves?
Because the so-called sound refers to vibration. Whether it is air or liquid / solid vibration, the propagation of vibration is wave
Where does sound travel in the form of waves?
medium
A vacuum without a medium cannot transmit sound
RELATED INFORMATIONS
- 1. Sound travels in the form of waves, which we call ()
- 2. How does the sound from the vibration of the sound source reach our ears
- 3. Chapter II section I generation and transmission of sound 1. Look at the four pictures in figure 2.1-1. Answer: the beautiful sound in the first picture is the string_________ Issued; A moving song is a vocal cord_________ Issued; The deafening waterfall sound in the second picture is the sound of water_________ Issued; In the third picture, the noise of electric grinding wheel is grinding wheel noise_________ Issued; In the fourth picture, the chirping of a toad is a chirping sac_________ Issued; In Figure 1-2, the male cicada chirps by means of the ventral articulator________ And the mosquito's "bark" depends on_________ Yes_________ It can be seen that the common feature of objects when they sound is that they are _____, Sound is made by objects________ The object that is vibrating and making sound is called ____ 2. Strike the gong and bell. The gong and bell sound endlessly because they are still ____ Cover the surface of the Gong quickly with your hand, and the sound of the Gong disappears quickly, indicating_________ Stop making sound stop
- 4. The transmission of sound needs ____, In physics, such matter is called _________ No sound
- 5. Why is Hawking called the king of the universe?
- 6. Hawking's charm () is that he is a legendary physics genius, and () he is an admirable strong man in life Fill in the text with appropriate connectives
- 7. Hawking's viewpoint in a brief history of time
- 8. 1. There are two resistors with the same resistance value. If they are connected to the same power supply and have the same power on time, the total heat released by the resistors in parallel is times that released by the resistors in series 2.17. A constant value resistor, connected to the circuit, generates Q heat per minute. Now you want it to generate 3Q heat per minute. The following measures are correct: () A. Change the voltage to 3 times the original B. change the voltage to 3 times the original C. Fold the resistance in half and connect it to the original circuit D. change the current intensity to 3 times of the original
- 9. Is it true that the noise that exceeds environmental protection must be harmful
- 10. Seeking the story of philosopher Hegel Who knows?
- 11. A sound source vibrates 720 times in 2 minutes. What is the frequency
- 12. What is the formula of free fall What does s in the formula mean
- 13. Energy variation in mechanical waves Where does the mechanical wave have the greatest kinetic energy? Where is the greatest potential energy? How does the energy change as the wave propagates?
- 14. Formula for calculating magnetic field strength Calculate the strength of the magnetic field at that distance angle
- 15. How to understand the true meaning and revolutionary nature of Hegel's philosophy and the internal contradiction of Hegel's philosophy?
- 16. What is the noun interpretation of law?
- 17. What is the reason why China's legitimate seat in the United Nations has been restored and China US relations have begun to normalize? A successful development of atomic bomb B improvement of China's comprehensive national strength
- 18. Hawking introduction
- 19. On December 26, 2004, a century tsunami occurred, but animals did not die on a large scale. From a physical point of view: () A some animals can hear ultrasonic waves B some animals can hear infrasound waves
- 20. The artificial satellite makes a uniform circular motion around the earth, its orbit radius is r, its linear velocity is V, and its period is t. if you want to change the period to 2T, what methods can be adopted: A. R remains unchanged, so that the linear velocity becomes 1 / 2V, B.V remains unchanged, and the orbit radius becomes 2R C. yes, the orbit radius becomes (3 times better, 4 times lower) d. increase the height of the satellite by R