1 Light Year is equivalent to how much metre?

9.5 \times 10^{15}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

950 \times 10^{15}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

9.5 \times 10^{19}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

905 \times 10^{15}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $9.5 \times 10^{15}$
One light year is defined as the distance travelled by light in one year in vacuum.
Speed of light in vacuum $c = 3 \times 10^{8} m / s$
Time in one year $t = 1 y e a r = 365 \times 24 \times 60 \times 60 = 3.1536 \times 10^{7} s$
Thus distance travelled by light in one year $d = c t$
$⟹ d = 3 \times 10^{8} \times 3.1536 \times 10^{7} = 9.5 \times 10^{15} m$

Suggest Corrections

Similar questions

Q. The value of Planck's constant is

6.63 \times 10^{- 34} J s .

The velocity of light is

3 \times 10^{8} m / s .

If the wavenumber of a quantum of light is

2.5 \times 10^{7} m^{- 1}

, calculate its frequency.

Q. Calculate the minimum frequency required to remove a first shell electron completely from a hydrogen atom. Given: R

= 1.097 \times 10^{- 2}

^{- 1}

The frequency of radiations emitted when electron falls from n = 4, to n = 1, in H-atom would be:

(Given E₁ for H=2.18×10^-18J atom ^-1 and h=6.625 ×10^-34 Js.)

The maximum kinetic energy of the photoelectrons is found to be $6.63 \times 10^{- 19} J$ . When the metal is irradiated with a radiation of frequency $2 \times 10^{15} H z$ , the threshold frequency of the metal is about

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be

(Given ionization energy of $H = 2.18 \times 10^{- 18} J a t o m^{- 1}$ and $h = 6.625 \times 10^{- 34} J s$ )

Join BYJU'S Learning Program

1 Light Year is equivalent to how much metre?

The correct option is A 9.5×1015One light year is defined as the distance travelled by light in one year in vacuum.Speed of light in vacuum c=3×108 m/sTime in one year t=1 year=365×24×60×60=3.1536×107 sThus distance travelled by light in one year d=ct⟹ d=3×108×3.1536×107=9.5×1015 m