ACTIVITY 4
Multiple choice. Choose the letter of the correct answer.

1.Which medical instruments make use of sound energy to detect abnormalities of internal organs?

lasers and x-rays c. stethoscope and ultrasound machine

scanning machines d. thermometer and lens

2.Sound is made by ____________.

Colliding objects

Vibrating objects

Heated Objects

I only c. I and II

II only d. I, II, and III

3.Why is sound used for taking pictures of babies inside the womb?

Sound is the least harmful among sound, light and heat.

The babies inside the womb can already hear sounds, but cannot see yet.

Light will not pass through the mother’s skin and flesh, while heat will just be absorbed and will not be reflected.

Sound can be transmitted safely through human tissues and fluids, and can be reflected back to be used for imaging.

4.Sound travel FASTEST through which medium?

Solid c. Liquid

Gas d. Empty space

5.Why do we not hear sound in outer space?

There is no one out there to hear it.

It is so cold.

It is a vacuum or empty space so there is no medium for sound to travel.

There are too many stars that are exploding.

Need ko na po toh now bukas na po kase Ito Ipapasa
:/