40.0N
20.0N
5.0N
2.5N
Correct answer is D
\(g_1 = \frac{Gm_1m_2}{r^2_1}\)
\(m_1m_2 = \frac{gr^2_1}{G}\)
\(g_2 = \frac{Ggr^2_1}{Gr^2_2} = \frac{10 \times 0.1^2}{0.2^2}\)
= 2.5N
130.6Hz
182.9Hz
358.4Hz
501.8Hz
Correct answer is C
\(\frac{f}{256} = \sqrt{\frac{196}{100}}\)
f = \(\sqrt{\frac{256^2 \times 196}{100}}\)
= 356.4Hz
stationary and longitudinal
stationary and mechanical
mechanical and longitudinal
progressive and transverse
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements about sound is correct?
when sound travels from air to a denser medium, it is refracted away from the normal at the point of incidence
sound travels faster in air than in water
the wavelength of sound changes when it travels from to water
the frequency of it travels from air to water
Correct answer is C
No explanation has been provided for this answer.
Dispersion of white light by a glass prism occurs because
white light consist of a mixture of seven different colour
the refractive index of glass is different from each constituent colour of white light
the speed of each colour of light in the glass is proportional to the refractive index of glass for each colour
the speed of each colour of light in the glass is proportional to the angle of refraction in he prism
Correct answer is D
No explanation has been provided for this answer.
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