Category 1: Electromagnetic Spectrum
Which type of electromagnetic wave has the highest energy?
What are gamma rays?
What is the formula for kinetic energy?
What is KE=1/2mv2?
What is the formula for momentum?
What is p=mv?
Which type of signal uses binary code: digital or analog?
What is digital?
What unit is used to measure energy?
What are Joules?
What part of the EM spectrum can humans see?
What is visible light?
What type of energy is stored in a stretched rubber band?
What is elastic potential energy?
What type of collision conserves both momentum and kinetic energy?
What is an elastic collision?
Which signal type is more prone to distortion?
What is analog?
Which wave travels fastest: radio, visible, or X-rays (in a vacuum)?
Trick question — all EM waves travel at the same speed in a vacuum
Arrange these in order of increasing frequency: radio waves, visible light, gamma rays.
What is radio waves < Visible light < Gamma rays?
A 4 kg object is moving at 3 m/s. What is its KE?
What is 18 J?
A 2 kg object moves at 5 m/s. What’s its momentum?
What is 10 kg*m/s?
Give one reason digital signals are preferred in communication
What is they are more reliable; easier to compress; less noise?
Why are microwaves used in cooking?
Their frequency excites water molecules, producing heat.
Explain why X-rays can be used to view bones but not muscles.
What is bones absorb more X-rays due to higher density; muscles let X-rays pass through?
Describe how energy transforms as a skateboarder moves up and down a ramp.
What is KE converts to PE going up; PE converts to KE coming down?
What happens in a perfectly inelastic collision?
What is the objects stick together after the collision
Why can digital signals be easily regenerated?
What is binary signals are simple to restore as 0s and 1s?
How does increasing an object’s speed affect its kinetic energy?
KE increases exponentially because of the velocity squared.
What is the wavelength range of visible light in nanometers?
What is approximately 400–700 nm?
Calculate the gravitational potential energy of a 5 kg rock 10 m off the ground.
What is 490 J?
Two carts collide. Cart A (3 kg at 2 m/s) hits Cart B (2 kg at rest). If they stick together, what is their final velocity?
What is 1.2 m/s?
Compare how analog and digital signals transmit sound information.
Analog: continuous wave that varies smoothly; Digital: sampled data turned into binary.
Describe how data can be transmitted using digital electromagnetic waves.
Through binary code represented as on/off pulses of light, radio, or microwaves.