Buzz
Solve Exercise 1 on Page 49 Physics 12
Problem:
Characteristics of wave reflection on a stationary obstacle?
Solution:
If the obstacle is stationary, then at the reflection point, the reflected wave is always out of phase with the incident wave and cancels each other out.
Solve Exercise 2 on Page 49 Physics 12
Problem:
Characteristics of wave reflection on a freely moving obstacle?
Solution:
The reflected wave is always in phase with the incident wave at the reflection point.
Problem:
What is the cause of the formation of standing waves?
Solution:
Standing waves are formed due to the interference between the incident wave and its reflected wave.
Explanation:
Interference between the incident and reflected waves causes the phenomenon of standing waves.
Problem:
What are nodes and antinodes of a standing wave?
Explanation:
- Nodes are points where the amplitude of oscillation is zero.
- Antinodes are points where the amplitude of oscillation is maximum.
Problem:
Problem:
State the conditions for the formation of standing waves on a string with two fixed ends.
Solution:
The conditions are having two fixed ends, and the length of the string must be an integer multiple of the wavelength.
Giải bài 6 trang 49 SGK Vật lý 12
Problem:
State the conditions for the formation of standing waves on a string with one fixed end and one free end.
Solution:
The requirement is that the length of the string must be an odd multiple of λ/4.
Giải bài 7 trang 49 SGK Vật lý 12
Problem:
Choose the correct statement.
At the point of reflection, the reflected wave:
A. is always out of phase with the incident wave.
B. is out of phase with the incident wave if the obstacle is fixed.
C. is out of phase with the incident wave if the obstacle is free.
D. is in phase with the incident wave if the obstacle is fixed.
Solution:
Answer: B.
Exercise 8 Solution, page 49 Physics 12 Textbook
Problem:
Choose the correct statement.
In a standing wave system on a string, the distance between two consecutive nodes or two consecutive antinodes is:
A. one wavelength.
B. two wavelengths.
C. one-quarter of a wavelength.
D. half a wavelength.
Solution:
Answer: D.
Explanation:
Problem:
A long guitar string, 0.6 m in length, vibrates with a unique antinode (at the center of the string).
a) Calculate the wavelength λ of the wave on the string.
b) If the string vibrates with three antinodes, what is the wavelength?
Solution:
Problem 10: On page 49 of the Physics 12 textbook
Problem: On a 1.2m long string with a standing wave system, counting both ends, there are a total of 4 nodes.
Given the wave speed on the string as v = 80 m/s. Calculate the frequency of the string oscillation.
Solution:
In Chapter I, Physiology of Sound Oscillations, students study the characteristics of sound. Refer to the hints for solving exercises on page 59 of Physics 12 to master Physics 12.
The physical characteristics of sound are the next part of Chapter I, Mechanical Oscillations in Physics 12, Grade 11.
