Physics
Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is :

1.5
1.2
2
1

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Physics
Ice is packed in saw dust because

Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.

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