AIEEE Exam

A blackbody with surface area A and
temperature 127ºC emits an amount of radiation
E J/s. What is the radiation emitted by another
blackbody with surface area 2A and temperature
327ºC ?
(A) 10.125 E (B) 3 E
(C) 4.5 E (D) 6.75 E

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AIEEE Other Question

The potential energy (in joule) of a small block
of mass 2 kg moving in the x-y plane is given by
U = 6x + 8y
where the position coordinates x and y are
measured in metre. If the block is at rest at point
(6 m, 4m) at time t = 0, it will cross the y-axis at
time t equal to -
(A) 1 s (B) 2 s (C) 3 s (D) 4 s
The sound level of the chirping made by a bird at
a distance of 5 metres is measured is 30 dB.
When the same bird is 50 metres away, the
sound level is measured at 10 dB. How many
times is the amplitude of the sound wave at
5 metres away compared to 50 metres away -
(A) 3 times greater (B) 10 times greater
(C) 20 times greater (D) 100 times greater