waves Flashcards
A transverse wave is …
When the motion of particles are perpendicular to direction of wave
Examples of tranverse waves
- light
- water
- EM waves
A longitudinal wave is…
When the motion of the particles are parallel to direction of the wave
Examples of longitudinal waves
- sound
- spring
- slinky
Frequency =
Number of complete waves passing a fixed point per second
Time period=
Time taken for one complete wave to pass a fixed point
Speed of light in air
3 x 10^8
Maximum diffraction
when gap size equal to wavelength
Does interference affect digital?
No, the signal can still be decoded
What is an virtual image?
An image which cant be projected on a screen
What happens when light hits a rough surface?
It still obeys law of reflection but since the direction of normal is different for each ray, the light is scattered
What is refraction?
When light passes from one medium to another Slows down and changes direction
Refractive index of vacuum =
1
Refractive index of water =
1.33
Refractive index of glass =
1.5
TIR occurs when…
Angle of incidence is above critical angle
Critical angle for glass =
42
Critical angle for water =
49
Why is diamond sparkly?
- high refractive index of 2.4
- low critical angle
- more TIR
- more sparkly
Sound is caused by …
Mechanical vibrations
Speed of sound in air
330 m/s
speed of sound in water
1400 m/s
A microphone converts …
Changing air pressure from a sound wave into an alternate electrical voltage that can be viewed on an oscilloscope
Quality of sound depends on …
Shape of wave
