0o and 60o
90o and 30o
0o and 30o
90o and 60o
Correct answer is D
No explanation has been provided for this answer.
Which of the following optical instruments does not depend on the use of plane mirrors?
kaleidoscope
simple microscope
sextant
simple periscope
Correct answer is B
No explanation has been provided for this answer.
4.33 x 108ms-1
4.00 x 108ms-1
2.25 x 108ms-1
1.33 x 108ms-1
Correct answer is C
\(_an_w = \frac{4}{3} = \frac{\text{speed of light in air}}{\text{speed of light in water}}\)
\(\frac{4}{3} = \frac{3 \times 10^8}{x}\)
x = \(\frac{9 \times 10^4}{4}\)
= 2.25 x 108m/s
4.00s
2.50s
0.25s
0.04s
Correct answer is C
F = \(\frac{v}{\lambda} = \frac{0.2}{5 \times 10^{-2}} = 4Hz\)
T = \(\frac{1}{f} = \frac{1}{4} = 0.25s\)
Which of the following statements about a progressive mechanical wave is correct?
it can be a plane polarised
its energy is localised at specific points of its profile
it does not require a material medium for its propagation
its frequency remains constant as it travels between different media
Correct answer is D
No explanation has been provided for this answer.