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JAMB Physics Past Questions & Answers - Page 246

1,226.

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

light can be diffracted

a source of light produces distinct shadows of opaque objects

a source of light produces interference patterns on a suitably placed screen

light can be reflected

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,227.

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 150Hz?

View answer & explanation

Correct answer is B

The fundamental frequency (Fo) = 40Hz

First overtone f1 = 2 $\times$ 40 = 80

Second overtone f2 = 3 $\times$ 40 = 120

Third overtone f3 = 4 $\times$ 40 = 160.

Hence there are just two overtones between 40Hz and 150Hz

1,228.

Which of the following instruments has a pure tone?

guitar

vibrating strings

tuning fork

siren

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,229.

A boat at anchor is rocked by waves whose crest are 100m apart and whose velocity is 25ms^-1. At what interval does the wave crest reach the boat?

2500.00s

75.00s

4.00s

0.25s

View answer & explanation

Correct answer is C

Distance between the boat and crest = 100m

time = $\frac{100}{25}$

= 4sec

1,230.

A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is

60.0ms^-1

6.0ms^-1

1.5ms^-1

0.6ms^-1

View answer & explanation

Correct answer is D

V = F $\lambda$

= 2 x 0.3

= 0.6ms^-1

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