The magnification of an object 2cm tall when placed 10cm in front of a plane mirror is
6.0
1.0
0.7
0.6
Correct answer is B
M = v = \(\frac{2}{2}\) = 1
25m
50m
100m
150m
Correct answer is D
==> \(\frac{v}{u}\) = \(\frac{hi}{ho}\)
==> \(\frac{5}{300}\) = \(\frac{2.5}{ho}\)
= 150m
Where can a man place his face to get an enlarged image when using a concave mirror to shave?
Between the centre of curvature and the principal focus
At the principal focus
Between the principal focus and the pole
At the centre of curvature
Correct answer is C
No explanation has been provided for this answer.
The characteristic of a vibration that determines its intensity is the
Frequency
Overtone
Wavelength
Amplitude
Correct answer is D
No explanation has been provided for this answer.
Which of the following factors will affect the velocity of sound?
An increase in the pitch of the sound
An increase in the loudness of the sound
Wind travelling in the same direction of the sound
A change in the atmospheric pressure at constant temperature
Correct answer is C
No explanation has been provided for this answer.