Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 86:

• JAMB 2003

An electron makes a transition from a certain energy level E_k to the ground state E₀. If the frequency of emission is 8.0 x 10¹⁴Hz The energy emitted is

A. 8.25 x 10^-19J
B. 5.28 x 10^-19J
C. 5.28 x 10¹⁹J
D. 8.25 x 10¹⁹J

Question 87:

• JAMB 2003

If the uncertainty in the measurement of the position of a particle is 5.0 x 10^-10m, the uncertainty in the momentum of the particle is

A. 1.32 x 10^-44Ns
B. 3.30 x 10^-44Ns
C. 1.32 x 10^-24Ns
D. 3.30 x 10^-24Ns

Question 88:

• JAMB 2004

A radioisotope has a decay constant of 10\(^{-7}\)s\(^{-1}\). The average life of the radioisotope is

A. 1.00 x 10⁷s
B. 6.93 x 10⁶s
C. 1.00 x 10^-7s
D. 6.93 x 10⁷s

Question 89:

• JAMB 2004

X rays can be used in the study of crystal structure because they

A. Have a very long-reaching wavelength
B. Have extremely short wavelength
C. Are invisible
D. Are very fast

Question 90:

• JAMB 2004

The particle and wave nature of matter are demonstrated in the equation

A. λ = ^hc/_E
B. λ = ^h/_P
C. λ = ^c/_f
D. λ = 2 d sin θ