Wave Reflection and Transmission
Physics ⇒ Waves and Sound
Wave Reflection and Transmission starts at 8 and continues till grade 12.
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See sample questions for grade 8
A light wave strikes a glass window at an angle. Some of the light passes through, and some bounces back. What is this an example of?
A sound wave travels from air into a brick wall. What happens to most of the wave's energy?
A student shouts towards a cliff and hears an echo 2 seconds later. What phenomenon is responsible for the echo?
A wave hits a smooth surface at an angle of 30° to the normal. At what angle will it reflect?
A wave travels from medium A to medium B. If medium B is denser, what happens to the speed of the wave?
Describe what happens to a sound wave when it hits a soft, thick curtain.
Describe what happens to a wave when it hits a rough surface.
Describe what happens when a wave encounters a boundary between two different media.
Explain what happens to the speed of a wave when it moves from air into water.
Explain why echoes are heard in empty rooms but not in rooms filled with furniture and curtains.
Explain why you can hear someone talking in the next room even if you cannot see them.
Explain why you can see your reflection in a mirror but not in a piece of paper.
If a sound wave travels from air into water, what happens to its wavelength if its frequency remains the same?
If the angle of incidence is 45°, what is the angle of reflection?
What is the normal in the context of wave reflection?
What is wave reflection?
When a wave is partially reflected and partially transmitted at a boundary, what determines the proportion of each?
A light wave strikes a boundary between air and water at an angle of 40° to the normal. If the angle of refraction in water is 28°, calculate the ratio of the speed of light in air to that in water. (Use Snell's Law: n₁sinθ₁ = n₂sinθ₂, and assume n = c/v for each medium.)
A sound wave moves from air into a denser medium. Predict what happens to the amplitude and energy of the reflected and transmitted waves at the boundary. Explain your reasoning.
A student sends a pulse down a rope that is attached to a wall. The pulse reflects back inverted. What does this tell you about the boundary at the wall?
