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JAMB Physics Past Questions & Answers - Page 299

1,491.

In a projection lantern of focal length f, the object distance u, is such that

u > 2f > f

u < f < 2f

u = f < 2f

f < u < 2f

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,492.

An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?

5cm

10cm

30cm

40cm

View answer & explanation

Correct answer is B

V = -2u

F = $\frac{uv}{u + v}$

20 = $\frac{uv - 2u}{u - 2u}$

u = 10cm

1,493.

Light of frequency 6.0 x 10¹⁴ Hz travelling in air is transmitted through glass or refractive index 1.5. Calculate the frequency of the light in the glass

4.0 x 10¹⁴Hz

6.0 x 10¹⁴Hz

7.5 x 10¹⁴Hz

9.0 x 10¹⁴Hz

View answer & explanation

Correct answer is A

1.5 = $\frac{6 \times 10^{14}}{F}$

F = 4 x 10¹⁴Hz

1,494.

To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to

the focal length

two times the focal length

the distance of the image

two times the radius of curvature

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,495.

The note produced by a stretched string has a fundamental frequency of 400Hz. If the length of the string is doubled while the tension in the string is increased by a factor of 4, the frequency is

200Hz

400Hz

800Hz

1600Hz

View answer & explanation

Correct answer is B

F = $\frac {1}{2L}$ $\sqrt\frac{T}{m}$

T₂ = 4T₁ ; L₂ = 2L₁

$\frac{2F_1L_1}{2F_2L_2}$ = $\sqrt\frac{T_1}{T_2}$

$\frac{400\times L_1}{F \times L_1}$ = $\sqrt\frac{T_1}{4T_1}$

F = 400Hz

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