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level: Level 1 of Chapter 12

Questions and Answers List

level questions: Level 1 of Chapter 12

QuestionAnswer
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is the formula used to calculate the Doppler effect:F₀ = (fₛ x v) ➗ (v ± vₛ )
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What is Malus's law equationI =I₀ cos² θ
What are progressive waves , what do they do?Waves that move through a material (or vacuum ) A progressive wave transfers energy from one position to another
Why are some waves called mechanical wavesif they need a substance (medium) through which to travel
How do particles of a medium vibrate in longitudinal wavesThey vibrate parallel to the direction of the wave velocity
How do particles of a medium vibrate in transverse wavesThey vibrate at right-angle to the direction of the wave velocity
Define intensity of a waveRate of energy transmitted (power) per unit area at right angles to the wave velocity
What is the formula for intensityPower ➗ area
Intensity is measured in...watts per square meter (W m⁻²)
Intensity of a wave generally decreased as it travels along. There are 2 reasons for this:1. Wave may 'spread out' 2. Wave may be absorbed or scattered
As a wave spreads out, its amplitude decreases, what does this suggests?Intensity I of a wave is related to its amplitude A
Intensity I is directly proportional to what in symbolsI ∝ A²
What is wave speed v , and what is it measured inSpeed with which energy is transmitted by wave Measured in m s⁻¹
What is the formula used to calculate wave speed in words and in symbolsWave speed = wavelengTH ➗ period v = (1➗T) ✖️ wavelenght
What is a common example of the Doppler effect?When an emergency vehicle passes you while sounding the siren. The pitch is higher as the vehicle approaches you, and lower as it moves away
What is the formula used to calculate the Doppler effect:F₀ = (fₛ x v) ➗ (v ± vₛ )
An electric current always gives rise to a magnetic field, what is this known as?electromagnetism
How is a magnetic field createdby any moving charged particles such as electrons
Light is a wave known as...electromagnetic wave
What is the approximate value for the speed of light in a vacuum3.0 x 10⁸ m s⁻¹
Is there a clear division between the different ranges or bands in the spectrumNo
Wavelength in the range .....nm to .....nm in free space (vacuum) are visible to the human eye400nm to 700nm
1nm = ......m1nm = 10⁻⁹ m
When are X-rays producedWhen electrons decelerate rapidly or when they hit a target metal at high speeds
How are Y-rays producedBy nuclear reactions, such as radioactive decay
What is a electromagnetic wavea disturbance in the electric and magnetic field in space
The electric field is shown oscillating in the ....... planevertical
The magnetic field is shown oscillating in the ........ planeHorizontal
What is polarisationWave property associated with transverse waves only
Only ........... waves can be plane polarisedTransverse
Light is a ..... wavetransverse
The light from the sun is unpolarised, what does this mean?means that it has oscillating electric field in all planes at right angles to the direction in which it travels
What is Malus's law equationI =I₀ cos² θ