Physics questions
20027 published questions with worked solutions.
- Instrument to measure intensity of radiation is
- Coefficient of emission of a surface does NOT depends upon
- The athermanous is
- When thermal radiations incident on athermanous medium, the temperature of the medium
- The coefficient of the absorption of thermal radiation of body is
- The sum of the absorptance, reflectance and transmittance of a body is
- The substance which are transparent to thermal radiation are
- The coefficient of transmission is the ratio of
- The coefficient of reflection is the ratio of
- A good absorber is a
- The diathermanous is
- Good absorbers of heat are:
- Co–efficient of reflection, co–efficient of absorption and transmission are related as :
- Good absorbers of heat are:
- The substances through which heat radiations can pass are called as :
- The substances through which heat radiations can not pass are called as :
- For athermanous substances, coefficient of transmission is :
- If an athermanous body absorbs 30% of the incident radiant energy, then reflection coefficient of the body is :
- Out of 10 J of radiant energy incident on a surface, the energy absorbed by the surface is 2 J and the energy reflected is 6 J....
- 512 calories of radiant heat are incident on a body which absorbs 224 calories. What is its coefficient of emission?