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 12
A sound wave strikes a boundary at an angle of 60° to the normal. What is the angle between the incident and reflected waves?
A sound wave with a frequency of 500 Hz travels from air (speed = 340 m/s) into water (speed = 1500 m/s). What is the wavelength of the sound in water?
A sound wave with an intensity of 0.5 W/m² is incident on a boundary. If 30% of the energy is reflected, what is the intensity of the transmitted wave?
A wave is incident at 30° to the normal on a smooth surface. What is the angle of reflection?
A wave pulse is sent down a rope attached to a heavier rope. Describe what happens at the boundary.
A wave pulse on a rope reaches a free end. What is the phase of the reflected pulse compared to the incident pulse?
A wave pulse with an amplitude of 2 cm is incident on a boundary. If the reflected pulse has an amplitude of 1.2 cm, what is the reflection coefficient?
A wave traveling along a string encounters a fixed end. What happens to the wave upon reflection?
A wave travels from medium A (speed = 200 m/s) to medium B (speed = 100 m/s). If the incident angle is 45°, what is the angle of transmission (refraction) in medium B?
Describe the difference between specular and diffuse reflection of waves.
Describe what happens to the amplitude of a wave when it is partially transmitted into a medium with higher impedance.
Explain why a wave is inverted when it reflects from a fixed boundary but not from a free boundary.
Explain why an echo is heard when a sound wave reflects off a distant wall.
Explain why the intensity of a reflected wave is usually less than that of the incident wave.
State the law of reflection for waves.
When a sound wave passes from air into water, what happens to its speed?
A light wave is incident from glass (refractive index n₁ = 1.5) onto water (n₂ = 1.33) at an angle of 50° to the normal. Calculate the angle of the transmitted wave in water.
A sound wave traveling in air strikes a boundary with a wall at an angle of 40° to the normal. If the wall absorbs 10% of the incident energy, what percentage of the energy is reflected and what percentage is transmitted?
A wave pulse is sent along a string that is attached to a ring which can move freely up and down at the end. Describe the phase and amplitude of the reflected pulse compared to the incident pulse.
A wave pulse traveling along a string with linear mass density μ₁ and tension T encounters a boundary with a string of linear mass density μ₂ (tension remains the same). Derive the expression for the amplitude of the reflected wave in terms of μ₁ and μ₂.
