CPCS 181 Test 1 UPDATED Exam Questions and CORRECT Answers

CPCS 181 Test 1 UPDATED Exam
Questions and CORRECT Answers
Speed Light Travels - CORRECT ANSWER- ✔✔- 3 x 10^5 km/s
- In a vacuum is constant
- Speed in transparent materials depends on colour


Photons - CORRECT ANSWER- ✔✔- Light thought as stream of particles (photons)
- Each carry nrg depending on frequency & wavelength


Pulse - CORRECT ANSWER- ✔✔Quick disturbance of short duration



Continuous Wave - CORRECT ANSWER- ✔✔Continuous series of pulses



Types of Waves - CORRECT ANSWER- ✔✔- S Wave
- P Wave


S Wave - CORRECT ANSWER- ✔✔Goes up & down (water)



P Wave - CORRECT ANSWER- ✔✔Moves in straight line (continuous w/ line) (sound
waves)


Wave Equation - CORRECT ANSWER- ✔✔v = λf
- Wavelength: l (m)
- Frequency: f (Hz)
- Wave speed: v (m/s)


Red Wavelength - CORRECT ANSWER- ✔✔- Long wavelength
- Low frequency
- Low nrg

, Blue Wavelength - CORRECT ANSWER- ✔✔- Short wavelength
- High frequency
- High nrg


Electromagnetic Spectrum - CORRECT ANSWER- ✔✔- Radio waves
- Microwaves
- Infrared visible light
- Ultraviolet
- X rays
- Gamma rays


EM Radiation - CORRECT ANSWER- ✔✔- Not all can penetrate Earth's atmosphere
- Gases in atmosphere absorb EM radiation , where most wavelengths from space don't reach
ground


Wein's Law - CORRECT ANSWER- ✔✔T [K] = 0.0029 [K.m] / λpeak
- Calculate temp. of any blackbody object


Blackbody - CORRECT ANSWER- ✔✔- Object that absorbs all radiation falling on it
- Doesn't reflect light (appears black when cold)


2 Types of Spectra - CORRECT ANSWER- ✔✔1. Continuous
2. Absorption


Continuous Spectrum - CORRECT ANSWER- ✔✔Un-interrupted EM radiation curve over
certain range of wavelengths


Absorption Spectrum - CORRECT ANSWER- ✔✔- Light passes through cooler medium
(usually gas) before reaching us