questions Flashcards
why air cons are placed on high wall instead of the floor?
Cold air sinks and warm air rises. This allows convection to occur. If the air con is placed on the floor, the cold air wont be spread evenly
define total internal reflection
when the light travels from a denser to less dense region at an angle of more than critical angle, total internal refraction occurs.
charge of electron
-1.6x10^-19
charge of proton
1.6x10^-19
what is the difference between heat and temperature
heat is energy that transfer from got region to cold region. Temperature is the degree of hotness
define specific heat capacity
specific heat capacity of substance is defined as the energy transfer needed to change the temperature of 1kg of substance by 1dc
what is latent heat of vaporization?
the specific heat of vaporization is defined as the amount of energy required to change 1kg of liquid to gas or vice versa at constant temperature
formula for specific latent heat of vaporization
dv = Q/m
what is latent heat of vaporization
the latent heat of vaporization is defined as the amount of energy required to change of liquid to gas or vice versa at constant temperature
how many bits does 1100 1001 0001 contain?
12 bits
what can we say about human sensation as a temperature indicator?
human sensation is too subjective to be suitable for estimating temperature
A glass containing hot water in the open. How to keep the water hot for as long as possible?
Use a styrofoam to cover the top of the glass and a dry towel to wrap the bottom of the glass
A glass containing cold water is placed in an open area. How to keep the water for as cold as possible?
Use a hard plastic cover to cover the top of the glass and a styrofoam for the bottom
