Karteikarten
Waves
Karten in diesem Stapel (28)
- 1Describe longitudinal waves and give an example.The direction of vibration is parallel.
An example is sound. - 2Describe transverse waves and give an example.The direction of vibration is perpendicular.
An example is light. - 3Name 4 examples of waves.Light (transverse)
Sound (longitudinal)
Electromagnetic
Mechanical - 4Define amplitude and what it corresponds to for sound waves.It measures energy which corresponds to loudness.
- 5Define frequency and what it corresponds to for sound waves and light waves.The number of waves made every second is called frequency.
Higher frequency = higher pitch (sound).
Higher frequency = color (light). - 6Define wavelength.Wavelength = the difference between the peak of one wave and the next.
It is used to measure pitch. - 7Define time period.The time for a wave to complete one oscillation.
- 8What is the approximate frequency range of human hearing?20 to 20 000
- 9How do you calculate wave speed?Frequency x wavelength.
- 10What are electromagnetic waves?They are oscillating, electric and magnetic fields.
- 11Which electromagnetic waves have the largest wavelengths and therefore the lowest frequency?Radio waves.
- 12What are the properties of radio waves?Lowest frequency on the electromagnetic spectrum.
Can occur naturally or artificially.
Generated by transmittors/recieved by recievers. - 13What are the risks of radio waves?Cancer and other disorders.
- 14What are the uses of radio waves?Transmitting television and radio programs
Garage door openers
Cell phones
Laptops with WiFi - 15What are the properties of microwaves?Second lowest wavelength and frequency
Used to heat up water molecules in a microwave oven.
Can cause harm to body tissues by internal heating. - 16What are the properties of infrared waves?Can be felt as heat.
Used in remote controls using coded light pulses.
Detected by night goggles and infrared cameras. - 17What are the properties of visible light?Only wavelength that can be observed by the human eye
Can be divided into smaller regions = colors (roygbiv)
Can be transmitted, reflected or absorbed. - 18Which color has the shortest wavelength?Violet
- 19Which color has the longest wavelength?Red
- 20What are the properties of ultraviolet?Shorter wavelengths than visible light
Can be seen by some animals
Provides vitamin D through absorption in the skin - 21What are some risks of ultraviolet rays?Too much exposure can damage your eyes, cause cancer and burn skin
Can protect with sunscreen and sunglasses - 22What are the uses of ultraviolet rays?Sterilized medical equipment
Dry clothes
Tanning beds
Detect art forgery - 23What are the properties of x-rays?X-rays transfer energy and are short transverse waves
They are absorbed by metal and bone
Transmitted by healthy body tissue - 24What are the uses of x-rays?Many medical uses as x-ray imaging can diagnose diseases, guide surgeons during medical prcedures, etc.
- 25What are the risks of x-rays?Radiation from x-rays can cause cancer
Children are more sensitive - 26What are the properties of gamma rays?They have the smallest wavelength/highest frequency
Comprised of photons
Ionizing radiation
Used to treat tumors and in PET scans
Can cause cancer and birth defects - 27What is the law of reflection?The angle of incidence is always equal to the angle of reflection.
- 28How is a prism able to create a spectrum of white light?Colors with a higher frequency are refracted more than those with a lower frequency.
The difference in the colors refractive index in the glass spreads out white light into a spectrum = Dispersion