Waves quiz

More questions about Waves

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which kind of wave carries radio broadcasts?

   Answer: Electromagnetic

   Why: Radio waves belong to the same family as visible light, so they move at light speed and can cross empty space, unlike sound.

2. 2 Medium

   What are a vibrating string's still points called?

   Answer: Nodes

   Why: Lightly touching a guitar string at its midpoint forces a node there, so it vibrates in two halves and sounds an octave higher.

3. 3 Hard

   Where inside Earth do earthquake S waves stop?

   Answer: Outer core

   Why: S waves cannot pass through liquid, so their absence on the far side of Earth after a quake revealed that the outer core is molten.

4. 4 Easy

   Why does lightning make thunder?

   Answer: Expanding hot air

   Why: A lightning bolt heats the air around it to about 30,000 °C, roughly five times hotter than the Sun's surface.

5. 5 Medium

   What sets a tsunami's speed across the open ocean?

   Answer: Water depth

   Why: In the deep ocean a tsunami can top 800 km/h, as fast as a jet plane, then slows to car speed as the seabed rises near shore.

6. 6 Hard

   How long is one wave inside a microwave oven?

   Answer: About 12 cm

   Why: Reflections inside the oven leave hot spots about 6 cm apart, half a wavelength, which is why a turntable keeps the food moving.