Unit 1 Conceptual Multiple Choice Questions
Unit 1 Conceptual Multiple Choice Answers
Unit 1.1 Multiple Choice Questions - Waves
Unit 1.1 Multiple Choice Answers - Waves
Unit 1.3 Multiple Choice Questions - Sound
Unit 1.3 Multiple Choice Answers - Sound
Unit 1.5 Multiple Choice Questions - Doppler Effect
Unit 1.5 Multiple Choice Answers - Doppler Effect
Unit 2 - Multiple Choice - Electromagnetic Waves Questions
Unit 2 - Multiple Choice - Electromagnetic Waves Answers
Unit 2.1 Multiple Choice Extended Questions - Waves
Unit 2.1 Multiple Choice Extended Answers-Waves
Unit 3 Multiple Choice Questions
Unit 3 Multiple Choice Answers
 

Unit 2 - Electromagnetic Waves Multiple Choice Questions

1. At a particular instant in time, a wave has its electric field pointing north and its magnetic field pointing up. In which direction is the wave traveling?

A. North
B. East
C. South
D. West

Answer B... EM waves are transverse waves with the electic and magnetic vibrations at right angles to each other and both perpendicular to the direction of motion of the wave. Use the right-hand rule.

2. How long should λ/4 antenna be for a cell phone operating at 1.8 GHz

A. 7.2 cm
B. 1.8 cm
C. 0.45 cm
D. 4.2 cm

Answer D...

λ = c/f

λ = (3 X 108)/(1.8 X 109)

= 1.67 X 10-1 m

The antenna is λ/4 so is λ is

The antenna is 4.2 X 10-2 m

3. In the vacuum of outer space, which quantity is always larger for X-ray radiation than for a radio wave?

A. Amplitude
B. Frequency
C. Wavelength
D. Speed

Answer B...

Speed of all EMR constantina vacuum...

Amplitude depends on energy...

Electromagntic Spectrum

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4. A comet at perihelion is 1.5 xX 108 km from the sun. How doesvthe intensity of radiation from the Sun change at aphelion when it is 3.0 X 108 km from the sun.

A. quadruple
B. double
C. decrease to ½
D. C. decrease to ¼

Answer D...

 

5. All other variables being equal, which surface would experience the greatest the radiation pressure from sunlight?

A. black surface.
B. red surface.
C. yellow surface.
D. white surface.

Answer D.. P = [kIavg]/c where 1 >= k <=2. k is 1 for perfect absorption and 2 for perfect reflection.

 

 

Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.