Question 826:

• JAMB 1995

The difference between sound waves and light waves is that sound waves

A. Are transverse while light waves are longitudinal
B. Require a medium to travel while light waves does not
C. Can be diffracted but light waves cannot
D. Cannot be reflected but light waves can

Question 827:

• JAMB 1995

The pitch of an acoustic device can be increased by

A. Increasing the frequency
B. Increasing the amplitude
C. Decreasing the loudness
D. Decreasing the intensity

Question 828:

• JAMB 1995

Total eclipse of the sun occurs when the

A. Earth is between the moon and the sun
B. Sun is between the moon and the earth
C. Moon is between the sun and the earth
D. Ozone layer is threatened

Question 829:

• JAMB 1995

What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?

A. 21^o
B. 22^o
C. 23^o
D. 24^o

Question 830:

• JAMB 1995

A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is

A. Convex and u =2f
B. Concave and u = 2f
C. Convex and u = f
D. Concave and u = f