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JAMB Physics Past Questions & Answers - Page 261

1,301.

The plane mirrors in a kaleidoscope are usually placed

at an angle of 60^o

parallel to one another

perpendicular to one another

at an angle of 45^o

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,302.

The magnification of the image of an object placed in front of a convex mirror is $\frac{1}{3}$ . If the radius of curvature of the mirror is 24cm, what is the distance between its object and its image?

8cm

16cm

24cm

32cm

View answer & explanation

Correct answer is D

F = uv ; v = 1u

12 = $\frac{v + 3v}{v + 3v}$

v = 16cm, u = 48cm

distance between U and V

= 48 - 16 =32cm

1,303.

Light of wavelength 5000 x 10^-8cm travels in free space with a velocity of 3 x 10⁸ms^-1. What is its wavelength in glass of refractive index 1.5?

3333 x 10^-8cm

5000 x 10^-8cm

6666 x10^-8cm

750010^-8cm

View answer & explanation

Correct answer is A

n = $\frac{\text{wavelength in space}}{\text{wavelength in glass}}$

1.5 = $\frac{5000 \times 10^{-8}}{\lambda g}$

$\lambda$ g = 3333 x 10^-8cm

1,304.

In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of 17cm. If the velocity of the sound wave is 340ms^-1. Determine the frequency

10Hz

20Hz

1000Hz

5780Hz

View answer & explanation

Correct answer is C

$\lambda$ = 2L

2 x 17 = 34cm

F = $\frac{V}{\lambda}$

= $\frac{340}{34 \times 10^{-2}}$

= 1000Hz

1,305.

When the tension in a sonometer wire is doubled, the ratio of the new frequency to the initial frequency is?

$\frac{1}{\sqrt2}$

$\frac{1}{2}$

$\sqrt2$

View answer & explanation

Correct answer is A

$\frac{F_1}{F_2}$ = $\sqrt{\frac{T_1}{T_2}}$

$T_2 = 2T_1$

$\frac{F_1}{F_2}$ = $\sqrt{\frac{T_1}{2T_1}}$

$\frac{F_1}{F_2}$ = $\sqrt2$

F $_2$ : F $_1$ = 1 : $\sqrt{2}$

$\frac{F_2}{F_1}$ = $\frac{1}{\sqrt2}$

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