Energy transfers
What is the Law of Conservation of Energy?
This is the law that states energy cannot be created or destroyed, only transferred or transformed.
The loudness of sound is measured in this unit.
Desibel
Does a flashlight work in space?
Yes, light can travel in a vacuum.
Both sound and light travel in this form.
The loudest natural sound ever recorded on Earth, caused by:
a. A tropical thunderstorm in Caribbean
b. The eruption of Krakatoa volcano
c. A landslide on Himalayas
d. An meteorite collision in Mexico
b. The eruption of Krakatoa volcano
This eruption in 1883 was so powerful that it was heard as far away as 3,000 miles (4,800 km) away. The explosion generated shockwaves that circled the Earth multiple times, and the sound was so intense that it ruptured eardrums of people hundreds of miles away. The eruption also caused a massive tsunami, killing tens of thousands of people, and the global climate was affected for years afterward, with temperatures dropping significantly due to the ash and gases released into the atmosphere.
You rub your hands together on a cold day. Energy transfers?
Kinetic energy-heat
When you shout into a canyon and hear your voice return a moment later, this phenomenon occurs.
Echo
Where light travels the fastest?
Vacuum, empty space
This type of wave describes sound, while light is a transverse wave.
longitudinal wave
This energy source powers the Earth’s water cycle, plant growth, and weather patterns.
The Sun!
A natural nuclear factory!
Describe the energy transfers when a battery powers a flashlight.
Chemical-Electrical-Light and heat
he speed of sound is fastest in this state of matter.
Solid
Sunlight strikes your skin. What is the energy transfer?
Light to thermal energy(heat)
Sound requires this to travel, but light does not.
A medium
Bats use this technique, which relies on sound waves, to navigate and hunt in the dark. They can use it to detect objects as small as a tiny insect in total darkness.
Echolocation.
In a hydroelectric dam, water flowing downhill turns turbines, converting this type of energy into electricity.
Gravitational energy turns to kinetic energy of the water. Mechanical energy also accepted.
Some animals, like elephants and whales, communicate using sound waves with frequencies too low for humans to hear. What is this type of sound called?
infrasound
If you stand in front of a wooden door with a flashlight, the light does not pass through because the door is an example of this type of object.
Opaque
Both sound and light can be described using these two key properties of waves.
frequency and wavelength
Earthquakes can produce some waves with a frequency of 65,000 Hz that travel the fastest. Dogs can listen to an earthquake arriving faster than humans. Why is that?
They can listen to some Ultrasounds, that have a frequency more than 20,000 Hz which is the limit for humans.
In a car engine, fuel is burned to release energy, which then moves the pistons and ultimately makes the wheels turn. This process involves multiple energy transformations. Name at least two of the energy transfers involved.
Chemical energy-kinetic energy-thermal energy
Humans can typically hear sounds in this frequency range, which includes common noises like speech and music.
20 Hz to 20,000 Hz
The shadow of a tree on the ground during a sunny day is caused by light traveling in this specific way.
Light travels in straight lines
The speed of sound in air is approximately 343 m/s, while the speed of light in air is about 300,000,000 m/s. How many times faster is light than sound?
874,000 times faster
An alien civilization on a planet 100 light years away from Earth is looking towards our planet using advanced telescopes. What do they see?
The Earth as it was 100 years ago and all the events that happened already!