Which of the following equation does not represent a SHM?
cosωt + sinωt
sinωt cosωt
1 sin2ωt
sinωt + cos (ωt + )
Emissive and absorptive power of a material at 2000 K is 8 and 10 respectively, calculate the emissivity of IBB (Ideal black body)
0.2
0.4
0.6
0.8
What is your observation when two sources are emitting sound with frequency 499 Hz and 501 Hz?
Frequency of 500 Hz is heard with change in intensity take place twice.
Frequency of 500 Hz is heard with change in intensity take place once.
Frequency of 2 Hz is heard with change in intensity take place once.
Frequency of 2 Hz is heard with change in intensity take place twice.
Assertion: Transverse sound wave does not occurs in gases.
Reason: Gases cannot sustain shearing strain.
If both assertion and reason are true and the reason is correct explanation of assertion.
If both assertion and reason are true but reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: CP is always greater than CV in gases.
Reason: Work done at constant pressure is more than at constant volume
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
When we heat the gas at constant volume, the heat is supplied to raise the temperature of gas only. When we heat the gas at constant pressure, the volume of the gas apart from temperature of gas rises. When the gas expands, it does some external work for increasing the volume. So in this case, the heat is supplied.
(a) to raise the temperature of the gas
(b) to do the mechanical work for expansion.
As a result more amount of heat is required to increase the temperature of the gas through the same amount when the pressure is kept constant. Hence CP is always greater the value of CV.
Assertion: During rapid pumping of air in tyres, air inside the tyre is hotter than atmospheric air.
Reason: Adiabatic process occurs at very high rate.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true but reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.