What is the wavelength of visible spectrum?
A). 8500 - 9800 angstrom
B). 7800 - 8000 angstrom
C). 3900 - 7600 angstrom
D). 1300 - 3000 angstrom
3900 - 7600 angstrom
3900 - 7600 angstrom.
1. What is the most common salt in sea water ?
2. The chief source of naphthalene is
3. The addition of gypsum to Portland cement helps in :
4. Quartz crystals normally used in quartz clocks etc. is chemically
5. Rock salt is a mineral containing
6. Which among the following elements is found in maximum percentage in the human body ?
7. Radioactive disintegration of uranium ultimately results in formation of
8. Which of the following does not contain a coinage metal?