Question

Calculate wavelength: 1. mass: 4.50×10^-2 velocity 31.3 2. mass: 6.64x10^-27 velocity: 1.52x20^7 3. mass: 0.140 velocity: 40.2 (also can someone explain how you get the right exponent for the answers i feel like I'm over contemplating this because i keep getting these questions wrong?)

Answer 1

1. debroglies equation

   l = h/P

   l = h/mv   (P= mv)

l = wavelength of wave associated with body = ?

v = velocity of body = 31.3 m/s

m = mass of body = 4.5*10^-2 kg

h = planks constant = 6.625*10^-34 j.s

l = ((6.625*10^-34)/(31.3*4.5*10^-2))

l = 4.7*10^-34 m

2. l = wavelength of wave associated with body = ?

v = velocity of body = 1.52*10^7 m/s

m = mass of body = 6.64*10^-27 kg

h = planks constant = 6.625*10^-34 j.s

l = ((6.625*10^-34)/(1.52*10^7*6.64*10^-27))

l = 6.56*10^-15 m

3. l = wavelength of wave associated with body = ?

v = velocity of body = 40.2 m/s

m = mass of body = 0.14 kg

h = planks constant = 6.625*10^-34 j.s

l = ((6.625*10^-34)/(0.14*40.2))

l = 1.18*10^-34 m