Question

2.) Determine the energy equivalent to a mass defect equal to 2.67 x 10^-26 kg.

(Mass defect means the missing mass after a nuclear reaction)

a.) 1.74 x 10^-9 Joule

b.) 6.39 x 10^-9 Joule

c.) 8.28 x 10^-9 Joule

d.) 2.40 x 10^-9 Joule

Answer __________

3.) Determine the de Broglie wavelength for an ball with a mass equal 0.50 kg moving with a

speed of 25 meter/second.

a.) 1.9 x 10^-38 m

b.) 8.4 x 10^-29 m

c.) 7.2 x 10^-34 m

d.) 5.3 x 10^-35 m

Answer __________

4.) An excited state of an atom has an estimated lifetime of 1.3 x 10 ^-6 seconds. Estimate the energy fluctuation (uncertainty) associated with this state.

a.) 8.7 x 10^-30 Joule

b.) 4.1 x 10^-29 Joule

c.) 9.4 x 10^-28 Joule

d.) 3.6 x 10^-26 Joule

Answer 1

2) Here by using the formula

E = h * f

E = 6.63 * 10^-34 * 7.29 * 10^14

E = 4.83 * 10^-19 J

the correct option is d

3. DEbroglie wavelength L = h/p = h/mv

h is placks constant = 6.626*10^-34 Js

m is mass = 0.5 kg

v is speed = 25 m/s

so

L = (6.626*10^-34)/(0.5 * 25)

Wavelength L = 5.3 *10^-35 m

option D is answer

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4. Eenrgy E = h/(4pi t)

E = 6.626*10^-34/(4pi * 1.3*10^-6)

E = 4.1 *10^-29 J

Option B is answer