Flashcards
Physics 1.5
Flashcards do conjunto (14)
- 1When a longitudinal wave passes through air, what happens to the air particles at a compression?They are pushed closer together
- 2What type of wave can be produced on a stretched string?Transverse, mechanical waves
- 3What is the speed of waves with a frequency of 5 Hz and a wavelength of 2 m?10 m/s
- 4What is the unit of frequency?Hertz, Hz
- 5What is the normal?A line drawn perpendicular to a reflecting surface
- 6What size is the image in a plane mirror?The same size as the object
- 7Why does refraction take place?Because waves change speed when they cross a boundary
- 8Why does light split up into different colours when it passes through a triangular prismBecsause different wave lengths of light are refracted by different amounts
- 9Why don't we often observe the diffraction of light during everyday life?Because the wavelength of light is very short
- 10What sort of waves are diffracted?All waves are diffracted
- 11What is the range of frequencies that can be heard by the human ear?20 Hz to 20 000 Hz (20kHz)
- 12What is the reflection of a sound called?An echo
- 13What happens to the pitch of a note as the frequency decreases?The pitch decreases
- 14Why do different instruments sound different when they play the same note?The waveforms are different