I think it B or D sorry if wrong
Answer:
If the frequency of a wave increases while its speed remains constant, the wavelength decreases i.e. the distance between successive crests decreases.
Explanation:
Most people work in the tertiary sector.
<span>Most people work in the tertiary sector is false because in developing economies most people work in the primary sector or in the secondary sector. the tertiary sector is about services, which are connected to a form of economy that is already developed. In this case, it is rare that people from developing countries work in the tertiary sector.</span>
