Question 4556:

• NECO 2005

A radio station broadcasts at a frequency of 400KHz. If the speed of the wave is 3.0 ×10-8 ms-1, calculate the wavelength of the radio wave.

A. 1.3 × 10²m
B. 3.0 × 10²m
C. 2.4 × 10²m
D. 5.0 × 10²m
E. 7.5 × 10²m

Question 4557:

• NECO 2005

Which of the following is/are longitudinal wave(s)?

I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string

A. I only
B. II only
C. I and II only
D. I and III only
E. II and III only

Question 4558:

• NECO 2005

Which of the following radiations has the shortest wavelength?

A. Infrared rays
B. Light waves
C. Microwaves
D. Ultraviolet rays
E. X-rays

Question 4559:

• NECO 2005

Which of the following statements is/are correct? Sound waves travel through

I. air
II. vacuum
III.Water

A. II only
B. I and II only
C. II and III only
D. I and III only
E. I, II, and III

Question 4560:

• NECO 2005

An electric motor primary converts

A. Electrical energy to chemical energy
B. Electrical energy to heat energy
C. Electrical energy to mechanical energy
D. Mechanical energy to electrical energy
E. Mechanical energy to light energy