1) frequency deifinition a) the number of wavves that pass a point every second  b) number of waves per second c) the length from peak to peak 2) what is frequency meauserd in a) alpha b) hertz c) beta 3) what happens when volume increases a) when the amplitude increases b) pitch increases c) wavelength increases 4) what happens when pitch increases a) amplitude decreases b) pitch decreases c) wavelength will be shorter and frequency increases 5) what is the formula for time a) d/t b) d/s c) dxt 6) alice walks at a speed of 1.4 m per second, for 30 secs ,how far did she walk. a) 42s b) 42 m c) 32m 7) how long did it take to drive 20 km at a speed of 40 m per second. a) 500mins b) 500secs c) 400m 8) mum walked at a speed of 0.5 m/s dad walked at a speed of 0.6 and flo 0.3 what is the average speed a) 0.47 m/s b) 0.46 m/s c) 0.45.5m/s 9) what has the lowest frequency in the electromagnetic spectrum a) microwaves b) infrared c) uv d) gamma e) x-ray f) radiowaves 10) what is the wavelength of radiowaves is it : a) more than 1m b) less than one metre c) 1 second 11) what is the frequency of microwaves a) 3x 10 to the power of 8 b) or 4 x 10 to the power of 8 c) or is it 300 mhz 12) name 3 uses of microwaves a) to cook food  b) water c) mobile phones d) radar e) sterilisation f) security machines 13) name 3 sources of visible light a) hot objects b) fire c) screens d) movies e) to cook f) to charge your phhone 14) name 3 uses of ultra- violet light a) steralisation b) cooking c) heating d) shellac nails e) skin treatments f) flashing lights 15) who discovered ultra violet light a) wilhelm rontgen b) Ian McAslan c) phillip josheman d) john william ritter 16) which has the highesst frequency on the electromagnetic spectrum a) infrared b) xray c) uv d) gamma 17) 2 uses of x-ray  a) medical imaging b) shellac nails c) cancer treatment d) security machines e) lights 18) Gamma rays have the highest frequency and comes from radioactive samples. What are its uses? a) astronomy b) cooking food c) nails d) cancer treatment e) xrays 19) Light travels quickly in a vacuum. What happens when light hits an object. a) reflection b) refraction c) gets weaker d) gets stroonger 20) If I'm long sighted, what kind of glass lenses do I need a) concave, spreads out the light waves b) convex glass, brings focus point of the light forward 21) Im shorted sighted and need CONCAVE lenses. What happens to the light waves a) Light waves hit the lens and spreads before the eye can focus b) light waves get closes c) light waves move backwards 22) Name three uses of lenses a) glasses b) to help focus c) magnifying glasses d) microscopes e) glass tables 23) three types of radiation a) alpha b) beta c) gamma d) hertz 24) Radiation can damage DNA in living cells which can lead to cancer. Name three safety precautions. a) wear gloves b) wear goggles c) wear a lead apron d) use tongs and hold source away from the body e) wash your hands f) keep away from radiation sources. 25) A= N/T - Activity (Bq) = Number of nuclei/ Time. If there are 1500 nuclei disintegrate in 60 seconds. Calculate the activity. a) 25 Bq b) 25 ms c) 25 Bq/s d) 30 Bq

physics

印刷
埋め込み

リーダーボード

表示スタイル

オプション

テンプレートを切り替える

自動保存: を復元しますか?