What are the desirable agronomic characteristics for crop improvements?
10/11/2024
Science
9th
Improvement in food resources
How do biotic and abiotic factors affect crop production?
10/11/2024
Science
9th
Sound
Explain how defects in a metal block can be detected using ultrasound.
10/11/2024
Science
9th
Sound
How is ultrasound used for cleaning?
10/11/2024
Science
9th
Sound
What is loudness of sound? What factors does it depend on?
10/11/2024
Science
9th
Sound
What is reverberation? How can it be reduced?
10/11/2024
Science
9th
Sound
A sound wave travels at a speed of 339 m s–1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
10/11/2024
Science
9th
Sound
A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10 m s–2 and speed of sound = 340 m s–1.
10/11/2024
Science
9th
Sound
Give two practical applications of reflection of sound waves.
10/11/2024
Science
9th
Sound
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
