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One mole contains 6.022 × 10²³ particles — if a mole of seconds passed, it'd be 19 quadrillion years.
Did you know?
One mole contains 6.022 × 10²³ particles — if a mole of seconds passed, it'd be 19 quadrillion years.
Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s, respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is (velocity of sound: 340 m/s)
Hz
Hz
Hz
Hz
To solve this problem, we will use the Doppler effect formula for sound.The formula for the observed frequency when the source and observer are moving towards each other is:
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