Propagation of light - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1979

The speed of light in air is 3 x 10⁸ms^-1. If the refractive index of light from air-to-water is \(\frac{4}{3}\), then which of the following is the correct value of the speed of light in water?

A. 4 x 10⁸ms^-1
B. 2.25 x 10⁸ms^-1
C. \(\frac{4}{9}\) x 10⁸ms^-1
D. 2.25 x 10²ms^-1
E. 4.33 x 10⁸ms^-1

Question 3:

• JAMB 1987

Which of the following statements supports the assumption that light travels in straight lines?

A. Light can be diffracted
B. A source of light produces distinct shadows of opaque objects
C. A source of light produces interference patterns on a suitably placed screen
D. Light can be reflected

Question 4:

• JAMB 1991

The image in a pin-hole camera is

A. Errect and formed by refraction through a lens
B. Virtual and formed by dispersion
C. Erect and gets sharper as the hole becomes larger
D. Inverted and formed by the light from each point travelling in a straight line

Question 5:

• JAMB 1993

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 10²ms^-1
B. 1.2 x 10³km
C. 3.0 x 10³km
D. 6.0 x 10 ⁵km