Activate a sound effect

This script will activate the beep sound when the MRT card in the trigger range.

using UnityEngine;
using System.Collections;

public class TapCard : MonoBehaviour {

    public AudioClip beep;
    AudioSource audio;

    // Use this for initialization
    void Start () {
        audio = GetComponent<AudioSource>();
    }

    // Update is called once per frame
    void Update () {

    }

    void OnTriggerEnter(Collider other) 
    {
        if (other.gameObject.CompareTag ("MrtCard"))
        {
            audio.PlayOneShot(beep, 0.7F);
        }
    }
}