Question 4466:

• NECO 2003

The distance between two successive crests of a water wave is 0.5m. If a particle on the surface of the water wave makes two complete vertical oscillations in 1s, calculate the speed of the wave.

A. 0.25ms^-1
B. 0.50ms^-1
C. 1.00ms^-1
D. 2.00ms^-1
E. 4.00ms^-1

Question 4467:

• NECO 2003

In 90 seconds, the mass of a radioactive element reduces to \(\frac{1}{16}\) of its original value. Determine the half- life of the element.

A. 15.0s
B. 18.0s
C. 22.5s
D. 30.0s
E. 45.0s

Question 4468:

• NECO 2003

Which of the following statements about the concept of solid friction is NOT true?

A. It always acts in the direction of motion
B. It causes wear and tear in car tyres
C. It depends on the nature of the surfaces in contact
D. It is independent of the area of the surfaces in contact.
E. It reduces the efficiency of the machine

Question 4469:

• NECO 2003

The space surrounding a magnet in which the magnetic force is exerted is ____________

A. Magnetic field
B. Magnetic flux
C. Magnetic point
D. Magnetic pole
E. Magnetic strength

Question 4470:

• NECO 2003

Which of the following scientists postulated that moving particles exhibit wave properties?

A. Ernest Rutherford
B. Erwin Schroedinger
C. Frank Hertz
D. Louis de Broglie
E. Werner Heisenberg.