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Saturday, 15 August 2026
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Physics Past Questions and Answers

Topic: Mechanical and electromagnetic waves

Jamb Physics Questions - Mechanical and electromagnetic waves

Question 11:
When a sound wave passes from air into water its
  • A Speed and frequency increases but its wavelength remains the same
  • B Speed and wavelength increases but its frequency remains the same
  • C Speed decreases
  • D Speed remains the same but its frequency and wavelength change
  • E Speed increases but its frequency and wavelength decreases
View Answer & Explanation
Question 12:
The speed of sound in air at sea-level is 340ms-1 while that of light is 300 000kms-1. How far (to the nearest meter) from the center of a thunderstorm is an observer who hears a thunder 2s after a lightening flash?
  • A 170ms<sup style='font-size: smaller;'>-1</sup>
  • B 340ms<sup style='font-size: smaller;'>-1</sup>
  • C 600ms<sup style='font-size: smaller;'>-1</sup>
  • D 680ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 13:
Which of the following pairs is NOT part of the electromagnetic spectrum? i. Radio waves. ii. Beta rays. iii. Gamma rays. iv. Alpha rays
  • A I and ii
  • B Iii and iv
  • C I and ii
  • D Ii and iv
View Answer & Explanation
Question 14:
Which of the following is TRUE of light and sound waves?
  • A They both transmit energy
  • B They both need a mediumfor propagation
  • C They are both transverse waves
  • D Their velocities in air are equal
View Answer & Explanation
Question 15:
Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10-3S. How far is the aircraft from the antenna? [c = 3 x 108ms-1 ]
  • A 6.0 x 10<sup style='font-size: smaller;'>2</sup>ms<sup style='font-size: smaller;'>-1</sup>
  • B 1.2 x 10<sup style='font-size: smaller;'>3</sup>km
  • C 3.0 x 10<sup style='font-size: smaller;'>3</sup>km
  • D 6.0 x 10 <sup style='font-size: smaller;'>5</sup>km
View Answer & Explanation