Use mathematical representations to describe a simple model for waves that includes how the amplitude of a wave is related to the energy in a wave.

  1. Physics

    Scientists Say: Watt

    Say Watt? This is a unit used to measure the flow of energy being used.

  2. Physics

    Gravity waves detected at last!

    Albert Einstein predicted gravitational waves 100 years ago. Now scientists have detected them coming from the collision of two black holes.

  3. Physics

    Explainer: What are gravitational waves?

    Albert Einstein had predicted that large catastrophes, like colliding black holes, should produce tiny ripples in the fabric of space. In 2016, scientists reported finally detecting them

  4. Physics

    How to catch a gravity wave

    Physicists have just announced finding gravity waves. The phenomenon was predicted a century ago by Einstein’s theory of general relativity. Here’s what it took to detect the waves.

  5. Tech

    Ground-thumping cheers help scientists

    Eager to test new sensors before the next ‘big one,’ earthquake scientists make use of a predictable source of ground-shaking: football fans.

  6. Tech

    Making cents of sounds

    Some people give up when a vending machine rejects their money. But one student decided to turn his frustration into inspiration. Through research, he showed how to identify coins by the sounds they make.

  7. Tech

    Laser vision reveals hidden worlds

    From discovering ancient ruins to forecasting climate change, the laser mapping technology called lidar is changing many fields of science.

  8. Tech

    Explainer: What are lidar, radar and sonar?

    Radar, sonar and lidar and are three similar technologies. Each relies on the echoing of waves — radio, sound or light waves — to detect objects.

  9. Earth

    Nepal earthquake offers hints of worse to come

    The magnitude 7.8 earthquake that crumbled much of Nepal’s capital city could be overshadowed by larger future earthquakes along the Himalayas, scientists say.

  10. Space

    Radio telescope picks up signals from intelligent life

    Astronomers tracked down the source of perytons, mysterious radio bursts. They had at first seemed to emanate from Earth’s atmosphere. Probing now suggests the life forms responsible had a penchant for leftovers.