Example of reflection in wave behavior.

Let’s go through each question one by one and figure out the correct answers step by step.

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Question 1:
The image shows a light ray hitting a flat surface (like a mirror) and bouncing off at the same angle. The person is seeing their reflection — that means the light bounced back to their eyes.

→ This is reflection.
Refraction would be if the light bent going *through* something (like water or glass). Absorption would mean the light got soaked up and didn’t bounce back.

✔ Correct answer: B. Reflection

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Question 2:
Light bending as it passes through a raindrop — this is what makes rainbows! When light goes from air into water (the raindrop), it slows down and bends. That bending is called refraction.

→ So, this is an example of refraction.

✔ Correct answer: C. Refraction

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Question 3:
What type of waves do NOT need a medium (like air, water, or solid) to travel?

- Sound waves? → Need air or something to vibrate → ✘
- Mechanical waves? → Also need a medium → ✘
- Longitudinal? → That’s a shape of wave (like sound), still needs medium → ✘
- Electromagnetic waves? → Like light, radio waves, X-rays → They can travel through empty space → ✔

✔ Correct answer: C. Electromagnetic

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Question 4:
Speed of sound vs. speed of light:

- Sound travels fastest in solids (because molecules are close together and pass vibrations quickly).
- Light travels fastest in vacuum or gases (no molecules to slow it down) — actually, light slows down in denser materials like water or glass.

So:
→ Sound = fastest in solids (high density)
→ Light = fastest in gas or vacuum (low/no density)

Looking at the options:

Option C says:
“sound waves are the FASTEST in solids (high density), while light waves are the FASTEST in gas (or no molecules)” → ✔️ That matches!

✔ Correct answer: C

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Question 5:
Why would a wave change direction?

Waves change direction when they move from one material to another — like from air to water. This is called refraction. It happens because the wave speed changes in different mediums.

Other options:
- Frequency too small? → Doesn’t cause direction change.
- Amplitude too large? → Affects loudness/brightness, not direction.
- Wavelength remained same? → If wavelength stays same, usually direction doesn’t change unless medium changes.

So the real reason is: It went from one medium to another.

✔ Correct answer: A

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Final Answer:
1. B
2. C
3. C
4. C
5. A