Simplify(0.3 x 105) \(\div\) (0.4 \(\times\) 107), leaving you answer in the standard form.
7.5 x 10-4
7.5 x 10-3
7.5 x 10-2
7.5 x 10-1
Correct answer is B
\(\frac{0.3 \times 10^5}{0.4 \times 10^7} = \frac{3 \times 10^{-1} \times 10^{5}}{4 \times 10^{-1} \times 10^7}\)
\(\frac{3 x 10^4}{4 x 10^4}\)
\(\frac{3}{4}\) x 104-6 = 0.75 x 10-2
= 7.5 x 10-3
Find the LCM of 23 x 3 x 52, 2 x 32 x 5 and 23 x 33 x 5
22 x 33 x 52
23 x 33 x 5
22 x 32 x 52
23 x 33 x 52
Correct answer is D
23 x 3 x 52
2 x 32 x 5
22 x 33 x 5
The L.C.M = 22 x 33 x 52
4 nodes
5 nodes
3 antinodes
4 antinodes
Correct answer is A
The 3rd overtone for an open pipe has 5 antinodes and 4 nodes.
A rainbow is formed when sunlight is incident on water droplets suspended in the air due to
interference
refraction
dispersion
diffraction
Correct answer is C
No explanation has been provided for this answer.
0
\(\frac{A}{2}\)
\(\frac{A}{4}\)
\(2A\)
Correct answer is D
This is a type of constructive interference. When two waves of equal amplitude are interfering constructively, the resulting amplitude is twice as large as the amplitude of an individual wave.
= A + A = 2A
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