The following is/are not a unit of time:
| (a) | second |
| (b) | parsec |
| (c) | year |
| (d) | light year |
Choose the correct option:
| 1. | (a, c, d) |
| 2. | (a, c) |
| 3. | (b, d) |
| 4. | (b, c) |
Hint: Light year and parsec are the units of length.
Step 1: Differentiate the unit of length and time.
We know that 1 light year = 9.46 x m
= distance that light travels in 1 year with speed 3x 10 m/s.
1 parsec = 3.08 x m
= Distance at which average radius of
earth's orbit subtends an angle of 1 per second
Here, the second and year represent time.
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