Can someone help me part A and B please.

(6%) Problem 12: TV-reception antennas for VHF are constructed with cross wires supported at their centers, as shown in the figure. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each channel. Suppose you measure the lengths of the wires for particular channels and find them to be 1.88 and 0.761 m long, respectively. theexpertta.com *50% Part (a) What is the frequency, in hertz, of the first channel? Grade Summary f1 = 1 Deductions Potential 100% sin( cos tan() 7 8 9 HOME Submissions Attempts remaining: 997 cotan() asin() acos() E A A 5 6 (0% per attempt) atan() acotan() sinh() 2 3 detailed view 0% cosh() tanh() cotanh() O END N P + 0% Degrees O Radians VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining: 2 Feedback: 0% deduction per feedback. 4 50% Part (b) What is the frequency, in hertz, of the second channel