Pls pls pls pls solve

D e a r S t u d e n t, a) F = 20 N r = ? τ = 10 N m τ = F r O r, 10 = 20 \times r T h e r f o r e, r = 0.5 m T h e r e f o r e, d i s \tan c e o f t h e p o i n t O f r o m t h e l i n e o f a c t i o n o f t h e f o r c e i s 0.5 m o p t i o n (4) i s c o r r e c t b) ν = 3.75 \times 10^{14} H z λ = ? c = 3 \times 10^{8} m / s e c S i n c e, λ = \frac{c}{ν} = \frac{3 \times 10^{8}}{3.75 \times 10^{14}} = 0.8 \times 10^{- 6} m = 0.008 \times 10^{- 4} m O p t i o n 1 i s c o r r e c t c) R = 40 c m f o c a l l e n g t h, f = \frac{R}{2} = \frac{40}{2} = 20 c m O p t i o n 3 i s c o r r e c t R e g a r d s

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