The fundamental frequency of a guitar is string 220 Hz, the frequency of the second harmonic is?

The fundamental frequency of a guitar is string 220 Hz, the frequency of the second harmonic is?

گٹار کی بنیادی فریکوئنسی سٹرنگ 220 ہرٹز ہے، دوسرے ہارمونک کی فریکوئنسی کیا ہے؟
Explanation
The frequency of the second harmonic is twice the fundamental frequency.
Fundamental frequency = 220 Hz
Second harmonic frequency = 2 × 220 Hz = 440 Hz