Log In Start studying!
Answers without the blur. Sign up and see all textbooks for free! Illustration

Q.23

Expert-verified
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 452

Answers without the blur.

Just sign up for free and you're in.

Illustration

Short Answer

Cell phone conversations are transmitted by high-frequency radio waves. Suppose the signal has wavelength 35 cm while traveling through air. What are the (a) frequency and (b) wavelength as the signal travels through 3-mm-thick window glass into your room?

Part (a) The frequency is Hz.

Part (b) The wavelength as the signal travels through 3-mm-thick window glass is 23.3 cm.

See the step by step solution

Step by Step Solution

Part (a) Step 1. Given information:

The wavelength of the signal travelling in air is

The speed of radio waves in air is

The refractive index of glass is

Part (a) Step 2. Calculating the frequency when the radio waves travel in air:

Frequency is defined as the complete waves travelling per unit time.

The formula to calculate the frequency of the radio signal in terms of c is given by

Substitute and 0.35m for into the above formula to calculate the frequency.

Part (b) Step 1. Calculating the frequency when the signal pass through the thick glass window:

The frequency is same in air as well as glass as it is the same source.

The velocity of the signal when travelling through the glass is given by

Substitute 1.5 for n and for c into the above formula to calculate the velocity.

The formula to calculate the wavelength of the signal is given by

Substitute for and for f into the above formula to calculate the wavelength of the signal through the glass window.

Recommended explanations on Physics Textbooks

94% of StudySmarter users get better grades.

Sign up for free
94% of StudySmarter users get better grades.