how to add a sound when collecting coins?

How do I add a sound when I pick up coins in game? This is the code I have already.

 function OnCollisionEnter(hit : Collision) {
             if(hit.transform.tag == "Coin") {
                 var cn : PauseGUI = this.GetComponent("PauseGUI");
                 cn.coins += 1;
                 coinsCollected += 1;
                 points += 100;
                 Destroy(hit.gameObject);
                 audio.clip = coinSnd;
                 audio.Play();
                 audio.volume = (5);
                 }
             }