yellow
red
black
blue
Correct answer is C
No explanation has been provided for this answer.
In the fig above, what is the angle of reflection of the ray of light at mirror M?
\( 90^{\circ} \)
\( 60^{\circ} \)
\( 45^{\circ} \)
\( 30^{\circ} \)
Correct answer is B
No explanation has been provided for this answer.
The fig above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y
12Hz
19Hz
60Hz
75Hz
Correct answer is D
No explanation has been provided for this answer.
\( 25^{\circ} \)
\( 40^{\circ} \)
\( 15^{\circ} \)
\( 55^{\circ} \)
\( 95^{\circ} \)
Correct answer is E
incident ray = XY
incidence angle i = 15\( ^{\circ} \)
rotation angle θ = 40º
angle that the reflected ray make with AY = i + 2θ
= 15 + [2 * 40] = 15 + 80 = 95º
62.6cm hg
72.5cm hg
79.5cm hg
85.9cm hg
Correct answer is D
No explanation has been provided for this answer.
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