True or false
1. When a wave reaches the boundary of a new medium,part of the wave can be reflected and part of the wave can be transmitted into the new medium.
2. When a wave crosses a boundary between a thin and a thick rope its frequency changes, but its wavelength and speed do not.
My work.
I think 1. is false
And 2. is true
To determine the correctness of the statements, let's break them down and analyze each one individually.
1. When a wave reaches the boundary of a new medium, part of the wave can be reflected, and part of the wave can be transmitted into the new medium.
This statement is actually true. When a wave encounters a boundary between two different media, such as when a light wave travels from air to water, part of the wave can be reflected back into the original medium, and part of the wave can be transmitted and continue traveling through the new medium. This behavior is known as wave reflection and transmission. By understanding the basic principles of wave propagation and the concept of refraction, one can deduce that this statement is indeed true.
2. When a wave crosses a boundary between a thin and a thick rope, its frequency changes, but its wavelength and speed do not.
This statement is false. When a wave crosses a boundary between two different mediums, such as a thin and thick rope, both the wavelength and speed of the wave change. As the wave enters the thicker rope, it experiences a change in medium, leading to a change in the wave's properties. Specifically, the wavelength tends to change because it is dependent on the properties of the medium itself, and the speed of the wave also alters since different mediums have different wave propagation speeds. The frequency, however, remains constant as it is a characteristic of the source producing the wave. Therefore, the statement is incorrect.
In conclusion:
1. True - When a wave reaches the boundary of a new medium, part of the wave can be reflected, and part of the wave can be transmitted into the new medium.
2. False - When a wave crosses a boundary between a thin and a thick rope, its frequency changes, and its wavelength and speed also change.