[Solved] You want to play a simple melody using TonalBuzzer on GPIO 13. Which code snippet correctly plays two tones (440 Hz and 880 Hz) each for 0.5 seconds in sequence?... | Raspberry Pi

Raspberry Pi - gpiozero Library

You want to play a simple melody using TonalBuzzer on GPIO 13. Which code snippet correctly plays two tones (440 Hz and 880 Hz) each for 0.5 seconds in sequence?

from gpiozero import TonalBuzzer
from time import sleep
buzzer = TonalBuzzer(13)

# Which code plays the melody correctly?

A) buzzer.play(440)
sleep(0.5)
buzzer.play(880)
sleep(0.5)
buzzer.stop()

B) buzzer.play(440)
sleep(0.5)
buzzer.stop()
buzzer.play(880)
sleep(0.5)
buzzer.stop()

C) buzzer.play(440)
buzzer.play(880)
sleep(1)
buzzer.stop()

D) buzzer.on()
sleep(0.5)
buzzer.off()
buzzer.on()
sleep(0.5)
buzzer.off()

APlay 440 Hz and 880 Hz simultaneously, sleep, then stop.

BPlay 440 Hz, sleep, stop, then play 880 Hz, sleep, stop again.

CPlay 440 Hz, sleep, then play 880 Hz, sleep, then stop buzzer.

DTurn buzzer on and off twice without tone control.

Step-by-Step Solution

Solution:

Step 1: Understand sequential tone playing
To play tones in sequence, call play(frequency) for each; subsequent calls change the frequency seamlessly without needing stop() between.
Step 2: Analyze each option
Play 440 Hz, sleep 0.5s, play 880 Hz (switches seamlessly), sleep 0.5s, stop correctly sequences tones without gaps. Play 440 Hz, sleep 0.5s, stop, play 880 Hz, sleep 0.5s, stop introduces silence between tones. Play 440 Hz immediately followed by 880 Hz, sleep 1s, stop effectively plays mostly 880 Hz. Turn buzzer on and off twice without tone control produces simple beeps, no specific frequencies.
Final Answer:
Play 440 Hz, sleep, then play 880 Hz, sleep, then stop buzzer. -> Option C
Quick Check:
play() changes frequency seamlessly = A [OK]

Quick Trick: play(new_freq) switches tones seamlessly; no stop needed between [OK]

Common Mistakes:

Stopping buzzer unnecessarily between tones
Trying to play multiple tones at once
Using on()/off() instead of play() for tones

Master "gpiozero Library" in Raspberry Pi

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

More Raspberry Pi Quizzes

You want to play a simple melody using TonalBuzzer on GPIO 13. Which code snippet correctly plays two tones (440 Hz and 880 Hz) each for 0.5 seconds in sequence?

Step 1: Understand sequential tone playing

Step 2: Analyze each option

Final Answer:

Quick Check:

Want More Practice?