Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 151:

• JAMB 2016

Which of the following electromagnetic waves has the shortest wavelength?

A. Visible Light
B. Ultraviolet rays
C. Infrared rays
D. Gamma rays

Question 152:

• JAMB 2016

A radioactive isotope has a decay constant of 10^-6s^-1.
Calculate its half - life?

A. 5.93 x 10⁶s
B. 6.93 x 10⁷s
C. 6.93 x 10⁹s
D. 5.93 x 10⁷s

Question 153:

• JAMB 2016

An electron in a hydrogen atom makes a transition from the ground level to the third level. If the energy at the ground level,calculate the energy at the third level.
[h = 6.6 x 10^-34Js; f = 10¹⁵Hz]

A. 1.41eV
B. 1.71eV
C. 1.61eV
D. 1.51eV

Question 154:

• JAMB 2016

Which of the following statements is Not true about atoms?

A. Atom of different elements have different atomic weights
B. The mass of an atom is concentrated in the nucleus
C. An atom is made up of a nucleus and number of electrons
D. Atoms of all elements are identical

Question 155:

• JAMB 2017

Which of the following is not an electromagnetic radiation?

A. X - ray
B. Radio waves
C. Sunlight
D. Sound waves