WAEC Physics Past Questions & Answers - Page 306

1,526.

A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.

A.

3

B.

6

C.

150

D.

300

E.

600

View answer & explanation

Correct answer is D

λ = 2 x 50 = 100cm = 1m.
V = fλ, f = v/λ = 300.

1,527.

In a wave the maximum displacement of particles from their equilibrium positions is called.

A.

frequency

B.

amplitude

C.

period

D.

wavelength

E.

wave velocity

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,528.

A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms^-1, calculate the distance between the layers.

A.

200 m

B.

400 m

C.

2400 m

D.

2600 m

E.

2800 m

View answer & explanation

Correct answer is A

X = Δvt/2 = {(2000x14)2 - (2000x12)2} = 200 m.

1,529.

The distance between a node and an anti-node for a transverse wave is equal to

A.

the wavelength

B.

thrice the wavelength

C.

one-half of the wavelength

D.

one-quater of the wavelength

E.

three quaters of the wavelength

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,530.

The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?

A.

30^o

B.

36^o

C.

44^o

D.

46^o

E.

54^o

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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