Lenses Review (Unit L Test Review)

Front

What is the relationship between wavelength and diffraction?

Back

Longer wavelengths diffract more than shorter wavelengths. This is why radio waves, which have longer wavelengths than light waves, can bend around obstacles more effectively.

Front

What does amplitude indicate in sound waves?

Back

Amplitude refers to the height of the wave and is directly related to the loudness of the sound. A sound with large amplitude is perceived as loud.

Front

What is a diverging lens?

Back

A diverging lens is a lens that causes parallel rays of light to spread apart (diverge). It is thinner in the center than at the edges.

Front

How does the Doppler effect affect sound frequency?

Back

The Doppler effect causes the frequency of a sound to increase as the source moves closer and decrease as it moves away, resulting in a higher pitch when approaching and a lower pitch when receding.

Front

In which medium does sound travel the slowest?

Back

Sound travels slowest in gases because the particles are further apart compared to liquids and solids, making it harder for sound waves to propagate.

Front

Define frequency in the context of waves.

Back

Frequency is the number of waves that pass a given point in one second, measured in Hertz (Hz). Higher frequency means more waves per second.

Front

What is the formula for calculating the speed of a wave?

Back

The speed of a wave (v) is calculated using the formula v = f × λ, where f is the frequency and λ (lambda) is the wavelength.

Front

Explain the concept of refraction.

Back

Refraction is the bending of light as it passes from one medium to another due to a change in speed. This can cause objects to appear distorted or displaced.

Front

What is the critical angle in optics?

Back

The critical angle is the angle of incidence above which total internal reflection occurs when light travels from a denser to a less dense medium.

Front

What is the difference between constructive and destructive interference?

Back

Constructive interference occurs when two waves meet in phase, amplifying the wave, while destructive interference occurs when they meet out of phase, reducing the wave.