46.0 Nm−2
75.0 Nm−2
80.0 Nm−2
85.3 Nm−2
Correct answer is B
Using P1T1=P2T2
P1 = 80Nm2
T1 = 47 + 273 = 320k
T2 = 27 + 273 = 300k
P2?
∴ = P_{2} = \frac{P_{1}T_{2}}{T_{1}}
= \frac{80 \times 300}{320} = 75.Nm^{2}
In which of the following media is the speed of sound the least?
Air
Brass
Water
Wood
Correct answer is A
No explanation has been provided for this answer.
A transverse pulse of frequency 9 Hz traves 4.5m in 0.6 s. Calculate the wavelength of the pulse.
3.33 m
0.30 m
0.83 m
1.20 m
Correct answer is C
Wavelength (\alpha) = \frac{Velocity (V)}{Frequency (f)}
Velocity = \frac{Distance}{Time} = \frac{4.5}{0.6}
= \frac{7.5}{9.0}
= 0.83m
A freshly demagnetized bar magnet is placed in the East-West direction to ensure that
the molecular magnets remain randomly arranged.
the molecular magnets are properly aligned
it is affected by the earth's magnetic field
the magnetic domains are within the earth's field
Correct answer is A
No explanation has been provided for this answer.
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