Question

The mass of an electron is 9.1x10-31 kg. If
its K.E. is 3.0x10-25 J, calculate its
wavelength​

Answer 1

Answer:

2.836×10^-90 kgJ.

Explanation:

Given:

Mass of electron= 9.1×10^-31 kg

Kinetic Energy = 3.0×10^-25 J

Applying formula;

Wavelength = h/(√2mK.E)

h= 6.626×10^-34 J (planck's constant)

putting values in the formula

Wavelength= 6.626×10^-34/ (√2×9.1×10^-31 × 3.0×10^-25)

= 6.626×10^-34/ (√5.46×10^-56)

= 6.626×10^-34/ 2.336×10^-56)

= 2.836 × 10^-90 kgJ