[nlee5687]

Calculate the wavelength of an electron (in pm) moving at a velocity of 30x10⁶ m/s.

I used the equation wavelength=c/v is this correct?

2.998x10⁸ m/s / 30x10⁶ m/s = 9.966

9.966 in picometer is 9.966x10^-12

is this right?

[DevaDevil]

wasn't it:

wavelength = h(Planck's constant) / m₀(electron mass)*v(velocity)

aka, the de Broglie wavelength

[nlee5687]

well if i used that then what would i use as my mass...

[darknietzsche]

The mass of an electron is a constant like the speed of light (2.998 x 10⁸ m/s) just look it up as well as Planck's constant and you should be able to do the math. The values should be in a chemistry or physics book for you to find or just look them up on the Internet.

for information http://scienceworld.wolfram.com/physics/deBroglieWavelength.html.

[sjb]

Calculate the wavelength of an electron (in pm) moving at a velocity of 30x10⁶ m/s.

I used the equation wavelength=c/v is this correct?

2.998x10⁸ m/s / 30x10⁶ m/s = 9.966

9.966 in picometer is 9.966x10^-12

is this right?

Careful, 30x10⁶ is not the same as 2.998x10⁸.

S

[sjb]

wasn't it:

wavelength = h(Planck's constant) / m₀(electron mass)*v(velocity)

aka, the de Broglie wavelength

Well, if you're going to bring De Broglie into things, you may want to consider what happens at high speeds etc.

See http://en.wikipedia.org/w/index.php?title=De_Broglie_hypothesis&oldid=169363780 and related links

S