0.3×10⁻⁷ kgms⁻¹
1.0×10⁻⁷ kgms⁻¹
3.0×10⁻⁷ kgms⁻¹
9.0×10⁻⁷ kgms⁻¹
Sol (B)
t=100×10⁻⁹ sec, P=30×10⁻³ Watt, C=3×10⁸ m/s
Incident energy=Pt
By debroglie wavelength, λ=h/p
and Energy of photon is E=hc/λ
From above two equations, E=pc
Momentump=Pt/C=30×10⁻³×100×10⁻⁹×10⁸=1.0×10⁻⁷ kg ms⁻¹
So, the answer is option (B).