Question
Ultra violet radiations of the Sun do not reach the
earth because, earth's atmosphere is surrounded by –Solution
The ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth. Ozone is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges, and is present in low concentrations  throughout  the  Earth's atmosphere. In total, ozone makes up only 0.6 parts per million of the atmosphere.
What type of rays are used in a CT scan to visualize the internal structures of the human body?
When white light passes through a glass prism, which color deviates the least?
The time period of a second’s pendulum is –
A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area o...
A transformer works on which principle?
Which of the following is a characteristic of sound waves?
What is the escape velocity from Earth? Â
Which of the following vitamins are called fat-soluble vitamins?
Pycnometer is an instrument used to measure the –
For a non-relativistic particle, the ratio of phase velocity to group velocity of de Broglie waves is:
