# Physics

1)An electromagnetic wave is produced by:

an accelerating charged particle or changing magnetic fields.

2)Find the period of an electromagnetic wave of wavelength 2.20 x 10^-2 m.

3.00 x 10^8 * 2.20 x 10^-2
= 6.60 x 10^6 s

1. 👍 0
2. 👎 0
3. 👁 100
1. 2) 1/period*wavelength=speedoflight
period=wavelength/speedoflight.

Also, think about your answer. A million seconds for one period? Goodness.

1. 👍 0
2. 👎 0
2. 2)I don't really understand 1/period*wavelength. I can't multiply period times wavelength if I don't know the period. but I did get a different answer. my book doesnt show me how to find the period I just used wavelength-frequency relationship for a wave equation to find the frequency

2.20 x 10^-2/3.00 x 10^8
= 7.33 x 10^-11

these are my choices by the way:

A)1.36 x 10^10
B)4.54 x 10^1
C)7.33 x 10^-11
D)6.60 x 10^6

1. 👍 0
2. 👎 0
posted by Jon
3. frequency = (speed of light)/(wavelength)
= 3*10^8 m/s/(2.2*10^-2 m)

Looks like (A) to me.

All I did was rearrange the equation BobPursley gave you.

If you would label your calculations with dimensions, and write down your equations, it would be easier for you to find your own errors. Once again, it seems you are just plugging in numbers at random.

1. 👍 0
2. 👎 0
posted by drwls
4. thank you but no I did not 3.00 x 10^8 is the speed of light constant I got from my book not out of my head that's what I use to find the wavelength

1. 👍 0
2. 👎 0
posted by Jon
5. the answer was C

1. 👍 0
2. 👎 0
posted by Jon

## Similar Questions

1. ### Physics!!

An electromagnetic wave is produced by: A. an accelerating charged particle or changing magnetic fields B. an accelerating uncharged particle and changing magnetic fields C. a stationary charged particle and a magnetic field D.

asked by sophie on April 12, 2009
2. ### Physics

A stationary particle of charge q = 1.4 10-8 C is placed in a laser beam (an electromagnetic wave) whose intensity is 3.5 103 W/m2. Determine the magnitudes of the (a) electric and (b) magnetic forces exerted on the charge. If the

asked by Elizabeth on March 26, 2013
3. ### Science

what is an electromagnetic wave comprised of? Electromagnetic waves consist of electric and magnetic fields in which each kind of field generates the other to keep the structure propagating through empty space at the speed of

asked by Brooke on November 28, 2006
4. ### College Physics

A charged particle travels undeflected through perpendicular electric and magnetic fields whose magnitudes are 4000 N/C and 20 mT,respectively. Find the speed of the particle if it is a proton. v= m/s Find the speed of the

asked by Lanise on February 19, 2010
5. ### College Physics

A radio station with a power of 20 kW sends out an omnidirectional wave at 1.25 MHz. a. If the electromagnetic wave has an electric field of 0.22 V/m, what is the magnetic field amplitude? b. What is the intensity of the wave at 5

asked by charlie on April 4, 2012
6. ### Physics

Remember the Poynting vector? The magnitude of this vector gives the amount of energy per second that flows through a unit area (in the direction it gives) because of the presence of a combination of electric and magnetic field,

asked by Ryan on October 14, 2015
7. ### physics

The solar wind is a thin, hot gas given off by the sun. Charged particles in this gas enter the magnetic field of the earth and can experience a magnetic force. Suppose a charged particle traveling with a speed of 9.80 x 10^6 m/s

asked by aml on February 8, 2011
8. ### science help pls pls

Infrared radiations are produced when a changing electric field creates a longitudinal wave parallel to it longitudinal wave perpendicular to it changing magnetic field parallel to it changing magnetic field perpendicular to it is

asked by Oscar on April 14, 2016
9. ### Physical Science

The frequency of circular motion for a charged particle moving around in the presence of a uniform magnetic field does not depend on ... a)The radius of the circle b)The mass of the particle c)The charge of the particle d)The

asked by Stephanie on March 13, 2010
10. ### phsics

A charged particle is moving in a uniform magnetic field. Which of the following statements concerning the magnetic force exerted on the particle is false? A) It does not change the kinetic energy of the particle. B) It can act

asked by benton on April 2, 2007

More Similar Questions