Question 8.1. What are the wavelengths of a television station which transmits vision on 500 MHz and sound on 505 MHz respectively? take speed of electromagnetic waves as 3×10^8 m/s.

Question 8.2. A person on the sea shore observes that 48 waves reach the shore in one minute. If the wavelength of the waves is 10 meter, then find the velocity of the waves.

Question 8.3. In a ripple tank 500 waves passes through a certain point in 10 second, if the speed of the waves is 3.5 m/s, then find the wavelength of the waves.

Question 8.4. A string of a guitar 1.3 m long vibrates with 4 nodes, 2 of them at the two ends. Find the wavelength and speed of the wave in the string if it vibrates

Question 8.5. Find the speed of sound in Helium Gas at 27° C, (γ = 1.66 and R = 8334 j/K mol).

Question 8.6. The speed of sound in air at 0°C is 332 m/s. What will be the speed of sound at 22°C?

Question 8.7. Two tuning forks P and Q give 4 beats per second. On loading Q lightly with wax, we get 3 beats per second. What is the frequency of Q before and after loading if the frequency of P is 512 Hz?

Question 8.8. On a sunny day, the speed of sound in the air is 340 m/s, 2 tuning forks A and B are sounded simultaneously. The wave length of the sounds emitted are 1.5 m and 1.68 m respectively. How many beats will produce per second?

Question 8.9. A sound source vibrates at 200 Hz and is receding from a stationary observer at 18 m/s. If the speed of sound is 331 m/s then what frequency does the observer hear?

Question 8.10. The first overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe 3.6 m in length. What is the length of the open organ pipe.