railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Wave

ଶୂନ୍ୟସ୍ଥାନରେ ଆଲୋକର ବେଗ ହେଉଛି:

1

3 × 108 ms-1

2

2 × 108 ms-1

3

3 × 107 ms-1

4

3 × 106 ms-1

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