Mastery May 2 Pt 1

If you breath on a mirror, the mirror clouds up. What are you actually seeing when the mirror clouds up?

• Water droplets that from from the cooled water vapor in your mouth.
• Carbon dioxide that your are breathing out from your lungs.
• Oxygen that you are breathing out from your longs.
• Evaporating water droplets.

Where is the greatest Magnetic force?

• answer 1 -A
• answer 2 - B
• answer 3 - C
• answer 4 - D

Look at the two pictures below. They show what happened when two solid blocks are put in the jars and each jar contains the same liquid. Based just on the pictures what can you say about the blocks and the jars? Note: A block in 3d looks different than the blocks in the picture which are in 2d.

• The liquid in the jars is water
• The block in jar 1 weighs more than the block in jar 2
• The block in jar 1 is floating lower in the liquid then the block in jar 2.
• The block in jar 1 must be made of metal and the block in jar 2 must be made of wood.

Which of the following is the best example of heat transfer by radiation?

• Steam rises from a cup of coffee.
• Warmth from a fire comes to you in a straight line on a windy day.
• An electric heater blows warm air throughout a room.
• The metal handle of a pan on an electric stove heats up.

When astronauts speak to each other in space while outside their spaceship, they use radio headsets that rely on electromagnetic waves. Which of the following best explains why radio headsets are used by astronauts to speak with each other in space?

• Electromagnetic waves can travel in a vacuum.
• Electromagnetic waves are difficult to distort.
• Electromagnetic waves travel quickly through air.
• Electromagnetic waves require little energy to generate.

Which of the following is an example of a longitudinal wave?

• infrared wave
• light wave
• microwave
• sound wave

Radio stations use radio waves to transmit electromagnetic signals. Which of the following best compares radio waves to other waves on the electromagnetic spectrum?

• Radio waves have the highest frequency of all electromagnetic waves.
• Radio waves have the longest wavelength of all electromagnetic waves.
• The frequency of radio waves is close to the frequency of ultraviolet radiation.
• The wavelength of radio waves is close to the wavelength of visible light waves.

Police use radar devices that apply the Doppler effect to determine the speed of a car. The diagram below shows electromagnetic waves sent from a police car and the reflected waves received by the police car.

• The received waves have a lower frequency and a longer wavelength.
• The received waves have a lower frequency and a shorter wavelength.
• The received waves have a higher frequency and a longer wavelength.
• The received waves have a higher frequency and a shorter wavelength.

The candle in jar 1 burned for 2 minutes after the lid was put on. The candle in Jar 2 burned for 8 minutes. About how long did the candle in jar 3 burn after the lid was put on?

• 1 minute
• 4 minutes
• 8 minutes
• We ae unable to say.

You have to read this closely. 3 answers are just phase changes.

• 1
• 2
• 3
• 4