English

If the Earth Did Not Have Atmosphere, Would Its Average Surface Temperature Be Higher Or Lower than What It is Now?

Advertisements
Advertisements

Question

If the earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.

Advertisements

Solution

In the absence of atmosphere, there would be no greenhouse effect on the surface of the Earth. As a result, the temperature of the Earth would decrease rapidly, making it difficult for human survival.

shaalaa.com
  Is there an error in this question or solution?
2013-2014 (March) Delhi Set 1

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.

(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).

(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).

(c) 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe].

(d) 5890 Å - 5896 Å [double lines of sodium]

(e) 14.4 keV [energy of a particular transition in 57Fe nucleus associated with a famous high resolution spectroscopic method (Mössbauer spectroscopy)].


Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.


Name the region beyond the violet end of the spectrum called.


Name the radiations used for the detection of fracture in bones.


Calculate the wavelength of a microwave of a frequency of 8.0 GHz.


A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)


A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver has a frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be:


Electromagnetic waves with wavelength

  1. λ1 is used in satellite communication.
  2. λ2 is used to kill germs in water purifies.
  3. λ3 is used to detect leakage of oil in underground pipelines.
  4. λ4 is used to improve visibility in runways during fog and mist conditions.
  1. Identify and name the part of electromagnetic spectrum to which these radiations belong.
  2. Arrange these wavelengths in ascending order of their magnitude.
  3. Write one more application of each.

What happens when an electron collides with a positron?


Name two electromagnetic waves of wavelength smaller than that of violet light.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×