Question

2 multiple choice 2 points
what property of electromagnetic waves makes it possible to use these waves to transmit information between a space shuttle and nasa mission control centers on the ground?
electromagnetic waves are transverse waves.
electromagnetic waves have very low velocity.
electromagnetic waves are all visible to human eyes.
electromagnetic waves can travel through a vacuum.
3 multiple choice 2 points
what happens to green light and red light when they shine on a green leaf?
both are absorbed.
both are reflected.
green light is absorbed, and red light is reflected.
green light is reflected, and red light is absorbed.
4 multiple choice 2 points
sound waves cannot carry energy through
water.
air.
a mirror.
a vacuum.

Explanation:

• Question 2: Electromagnetic waves can travel through a vacuum. Space is a vacuum, so this property allows information transmission between a space shuttle (in space) and NASA mission control centers (on Earth). Transverse wave nature (option 1) is a general property but not relevant here. Electromagnetic waves have high velocity (not low, so option 2 is wrong). Not all electromagnetic waves are visible (option 3 is wrong).
• Question 3: A green leaf appears green because it reflects green light. It absorbs other colors like red. So green light is reflected, and red light is absorbed.
• Question 4: Sound waves are mechanical waves. They need a medium (like water, air) to travel. A mirror (solid, can be a medium for sound in some cases if vibrations are transferred) but a vacuum has no particles. Sound cannot carry energy through a vacuum.

Answer:

• Question 2: Electromagnetic waves can travel through a vacuum.
• Question 3: Green light is reflected, and red light is absorbed.
• Question 4: a vacuum.