sun gamma rays

> kilometers from the earth. Sun's light travels at a great speed of 3x10 5 kilometers per second, and takes about 8 minutes to reach us. Light takes about 4.3 years to reach us from the next nearest star called Alpha Centauri. The sun is a mass of hot gases, about 109 times big..

Emission of a and b -rays bring some changes in the nucleus of the atom and the new element formed as a result of these charges is called daughter elemen..

In 1899, the study of radioactivity was taken up by Ernest Rutherford. He placed a little radium at the bottom of a small lead box and subjected the rays that emerged from it to the action of a very strong magnetic field at right angles to their direction. He found that the rays..

They are electromagnetic radiations like X-rays having very short wavelength, in the range of 10 -10 m to 10 -13 m. They affect photographic plate. They are unaffected by electric and magnetic fields. Their ionizing power is low, (about one hundredth of b - particles). T..

The length of the shadow of a vertical pole of height a cm is b cm. Find the approximate inclination of the sun's rays with respect to the horizontal. [Given a = 5 and b = 12.] => 33° or 38° or 28° or 23°..

. This zone is called troposphere. Therefore, at higher altitudes, some of us find it difficult to breathe. Above the troposphere is the stratosphere. This zone is rich in ozone. Hence, it is also called ozonosphere. In ozonosphere, the sunlight converts oxygen to ozone by photochemical dissolution..

Beta particles deviate more than alpha particles showing that beta particles are lighter than alpha particles or vice versa. Gamma rays do not deviate as they are electromagnetic waves and hence have no charge..

The stratosphere of the atmosphere has ozone (O 3 ). Ozone is known to absorb the Ultraviolet (UV) rays present in the sun's radiation. The UV rays are believed to cause skin cancer and mutations. Thus, the ozone protects us from the harmful effects of the UV rays..

Atmospheric refraction is the shift in apparent direction of a celestial object caused by the refraction of light rays as they pass through Earths atmosphere. The twinkling of stars and variation in size of the Sun are due to atmospheric refraction of starlight. Twinkling of S..

Above the troposphere is the stratosphere. This zone is rich in ozone. Hence, it is also called ozonosphere. In ozonosphere, oxygen in the presence of sunlight converts to ozone by photochemical dissolution. The ozonosphere completely absorbs short wave solar radiations, such as ultraviolet (uv) r..