How to pronounce“boom”in English

“Thunder boomed in the distance and lightning flashes lit up the horizon.”

“I was about to reach for the marmalade, when I heard the telephone tootling out in the hall and rose to attend to it. “Bertram Wooster's residence,” I said, having connected with the instrument. “Wooster in person at this end. Oh hullo,” I added, for the voice that boomed over the wire was that of Mrs Thomas Portarlington Travers of Brinkley Court, Market Snodsbury, near Droitwich – or, putting it another way, my good and deserving Aunt Dahlia. [...] “I'd give a tenner to have Aubrey Upjohn here at this moment.” “You can get him for nothing. He's in Uncle Tom's study.” Her face lit up. “He is?” [Aunt Dahlia] threw her head back and inflated the lungs. “UPJOHN!” she boomed, rather like someone calling the cattle home across the sands of Dee, and I issued a kindly word of warning. “Watch that blood pressure, old ancestor.””

“the boom of the surf”

“You should prepare for the coming boom in the tech industry.”