Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Physics Wave

Red colour lights are used for emergency purposes because

1

It has a long wavelength.

2

It has high frequency.

3

It carries high energy.

4

More than one of the above

5

None of the above

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