Question

(a) If the wavelength of an electron is 5.41 ? 10?7 m, how fast is it moving?

b) If the electron has a speed equal to 8.90 ? 10⁶ m/s, what is its wavelength?

Answer 1

Formula used for this question is in uploaded image please go through this first -

Now

Part A)-

wavelength = 5.41*10^-7 m

= h/mv

5.41*10^-7 = 6.63*10^-34 / 9.1*10^-31 * v

v = 6.63*10^-34 / 9.1*10^-31 * 5.41*10^-7

v = 0.13467 * 10⁴

v = 1346.7 m/s

Part B)-

if v = 8.90 ? 10⁶ m/s then = ?

= h/mv

= 6.63*10^-34 / 9.1*10^-31 * 8.90 ? 10⁶

= 8.1 *10^-11 m

Thankyou !!! Have fun

Please Rate High.