Which of the following characteristics of a wave is used in the measurement of the depth of the sea?
diffraction
interference
refraction
reflection
Correct answer is D
No explanation has been provided for this answer.
4000ms-1
400ms-1
250ms-1
40ms-1
Correct answer is B
y = 0.005 sin[x(0.5X - 200t)]
compare to Y = A sin(kx - wt)
\(\lambda\) = \(\frac{2\pi}{k}\) and F = \(\frac{w}{2\pi}\)
V= \(\lambda\)F
= \(\frac{2\pi}{0.5}\) x \(\frac{200}{2\pi}\)
= 400ms-1
convection
radiation from the surface
conduction through the stopper and the glass
conduction across the walls
Correct answer is C
No explanation has been provided for this answer.
increase
remain the same
decrease
first decrease and then increase
Correct answer is B
No explanation has been provided for this answer.
39 . 98 x 10-1J
9.75 x 102J
3.98 x 103J
9.75 x 103J
Correct answer is B
Q = mc\(\theta\)
= 0.05 x 390 x (70 - 20)
= 975J