Question 1
To understand how the voices of astronauts are transmitted back to Earth, it's important to consider the nature of sound. Sound is a type of wave that travels through a medium, which typically requires particles to transfer the vibration that our ears interpret as sound.
- Correct Response: C - mechanical waves
Sound waves are mechanical waves because they require a medium (such as air) to propagate. Even though sound can also be described with additional terms (like longitudinal), in the context of transmission back to Earth, "mechanical waves" is the best descriptor.
Question 2
The wavelength of a wave is typically determined by measuring the distance between specific points that repeat in the wave cycle. For sound waves, this is usually described in terms of compression and rarefaction, while for electromagnetic waves (like light), it's often measured from crest to crest or trough to trough.
- Correct Response: C - compression to rarefaction
While the other options are valid ways to measure wavelength in different types of waves, "compression to rarefaction" specifically pertains to sound waves (longitudinal waves). The other options refer to concepts pertinent to transverse waves.
In summary:
- Question 1: C - mechanical waves
- Question 2: C - compression to rarefaction