int led= 13;
int buzzerPin= 9;
int delayTime= 500;

void setup() {
  // put your setup code here, to run once:
  pinMode(led,OUTPUT);
  pinMode(buzzerPin, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(led,HIGH);
  tone(buzzerPin, 500);
  delay(delayTime);

  digitalWrite(led,LOW);
  noTone(buzzerPin);
  delay(delayTime);
}