The phenomenon that shows that increase in pressure lowers the melting point can be observed in
sublimation
condensation
coagulation
regelation
Correct answer is D
Regelation means refreezing a phenomenon whereby melted ice free from increased pressure refreezed when they are released from the pressure.
30 s
10 s
12 s
15 s
Correct answer is D
V = X/t
330 = ( 4.95 x 10^3)/t
t = (4.95 x 10^3/330 =
= 15 secs
The ground is always cold at night because the
atmosphere absorbs the sun's energy at night
earth radiates heat to the atmosphere at night
sun no longer shine at night
atmosphere reflects the sun's energy at night
Correct answer is B
The earth radiate heat to the atmosphere at night thereby lowering the temperature of the ground
A perfect emitter or absorber of radiant energy is a
conductor
black body
white body
red body
Correct answer is B
Dull, black surface are good emitters or absorbers of energy
Which of the following electromagnetic waves has the highest frequency?
utra - violet rays
radio waves
x - rays
infrared - rays
Correct answer is C
r - rays has the highest frequency followed by X - rays, ultraviolet ray, visible light intra - red and the least is radio weaves