Physics questions
20027 published questions with worked solutions.
- A black body emits: [NCERT 1982]
- The emissive power of sphere of area 0.02 m^2 is 0.5 kcal/sm^2 What is the amount of heat radiated by the spherical surface in 30...
- If the wavelength corresponding to maximum energy radiated from the moon is 14 micron, and Wien's constant is 2.8 10^ -3 K, then...
- If the temperature of a black body is increased then the wavelength corresponding to the maximum emission will
- Radiations which are trapped in green house are________ radiations.
- A star radiates maximum energy of wavelength _m at temperature T. What will be temperature of another star which radiates maximum...
- The wavelength corresponding to maximum emission for sun is 0.48 . The surface temperature of sun will be - (b = 3.0 10^ -3 m-K)
- The light emitted by the sun has the maximum wavelength of 570 nm. The light emitted by another star has the maximum wavelength...
- Solar radiation emitted by the sun resembles the radiations emitted by a black body at the temperature of 6000 K. Maximum...
- The surface temperature of the sun is about 6000°K. The sun's radiation has maximum energy at a wavelength of 0.5 . A certain...
- A black body emits radiation of maximum intensity an a wavelength of 5000 Å, when the temperature of the body is 1227°C If the...
- Solar radiation emitted by sun resembles that emitted by a black body at a wavelength of about 4800 Å. If the sun were to cool...
- As compared to a person with white skin another person with dark skin, will experience: [CPMT 1988]
- A hot body will radiate maximum energy if its surface is : [MNR 1992]
- If the maximum emission wavelengths of radiations emitted by moon and the sun are 10^ -4 m and 0.5 10^ -6 m respectively, then...
- Spectrum of a perfectly black body is :
- The black body at high temperature emits radiations of:
- The rate of cooling depends upon: 1) nature of radiating surface 2) area and mass of radiating body 3) area and mass of...
- Which of the following law states that _m is inversely proportional to absolute temperature?
- Wines displacement law is valid for: