# Homework Help: Smartphone and the type of wave?

1. Sep 15, 2014

1. The problem statement, all variables and given/known data

A person speaks into a smartphone.

What type of wave does the smartphone receive?

2. The attempt at a solution

I thought the answer is longitudinal wave. Is that right?

2. Sep 15, 2014

### Staff: Mentor

A longitudinal wave of what?

Do you "speak" with radio waves?

Note that those two things belong to completely different concepts.

3. Sep 16, 2014

Dear Sir, thank you for the reply and clarification.

The actual question is as follows:
David switched on his television set and radio. As he was resting, he received a phone on his smartphone. He picked it up and began talking over the phone.
In the above situation, how many of the devices are receiving signals in longitudinal wave?

Could you please kindly help me with the question?

4. Sep 16, 2014

### Staff: Mentor

Sure. What did you find out so far?

5. Sep 16, 2014

I found out that sound waves are longitudinal waves; radio waves are transverse waves.

My thinking is that as the boy speaks into the phone, sound waves are transmitted into the phone.

So my guess is that the phone is receiving longitudinal waves?

6. Sep 16, 2014

### Staff: Mentor

Good.

Sure

7. Sep 17, 2014