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PHYSICS

Physics
Red light has a wavelength of 70 A°. In "nm" it is

7 nm
700 nm
0.07 nm
70 nm

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Physics
Which of the following are used for accurately measuring very small time intervals ?

Quartz clocks
Atomic clocks
White dwarfs
Pulsars

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Physics
Which of the following is the unit of Astronomical Distance ?

Para/sec
Sec
Parsec
Metre/sec

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Physics
What is unit of Astronomical distance ?

Weber
Lux
Angstrom
Light year

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Physics
The SI unit of luminous emittance is :

Lumen
Lux
Candela
Lumen second

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